Malicious PDF — malware analysis report

Static analysis result for SHA-256 347153f42b5871b9…

MALICIOUS

PDF

99.5 KB Created: 2021-07-18 01:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 76f3ccd0cdd57154a7f2f32a748885b4 SHA-1: a6c712de323c0ee8a7e9f5da6be520d62b3db1c0 SHA-256: 347153f42b5871b9fb0e7980553a30f9829094b481a14b5db20c40da5071fc05
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_RANDOM_URL_LINK heuristic points to a specific suspicious URL that is likely the primary payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/40j0iti6rbokmikm8m70r4kdfk/5416819462.pdf In PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160987d65e6645---litinupetuxusobugorufa.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/989df4d9b67bd7deac2bfe15b8793251/86259902495.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8614a56e8---32681939172.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a8ab08180---dazipoditatujopuravuluzo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16095e500f32e3---dexenuxi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d631f1ea1c4---28060873232.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d896fa4e3de---41389100592.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/mevowovuvegexijumuzig.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//80203592934.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e831dbf01b---79378188615.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/30394806071.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/99317400798.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dec316e93576dc5777cee0c0faf363de/kuwiteda.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ea1e435aecd19473285824a32f915088/milizezomu.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/19632128601.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/12901384191.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a54d6e68caa73e705d5d91be93c91162/85216341533.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b3094d57---75891653261.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/urcjc3khlpaka33gf4iuaggo98/sesobalenofixilejum.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/siwuwuxoxawe.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6rceurtbcopi29de2imm7p4i1k/kipetopizesetavitebogifu.pdfIn PDF document text
    • http://dgjst.com/upfile/file/kunarojalepasagexiresa.pdfIn PDF document text
    • http://mldinsaat.com/image/files/95278495513.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c575032f5a1bdf6b626962d6f322f628/basevigefezuwumuvuni.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/zawigagugavojosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=photo+grid+and+video+collage+maker+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 17864 bytes
SHA-256: 98284489add9ecbadba21324c0b74ff8c963a1cff591d1c3549bfe505f69dd41
font_02_sfnt_off000151a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A9 10952 bytes
SHA-256: 2ab62c3468bccfa0d0205f74cfef3e138bded11929feae3612529a683b6101e4
font_03_sfnt_off00016aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA9 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd