Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1224c2c1a7ae6e…

MALICIOUS

PDF

86.0 KB Created: 2021-07-07 16:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7fb67cbce056a5f0c2205a7f30eab38a SHA-1: 586737116f8f39e20f744104b876b74d3690c183 SHA-256: ad1224c2c1a7ae6e9c7227d9b7ecc6cdcd932f25311ccbae05c0f7fcba3122a7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by multiple heuristics flagging it as a link farm pointing to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier further support its malicious nature. The primary attack pattern involves directing users to external URLs that likely host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dochoiotovn.com/uploads/userfiles/file/tunev.pdf In PDF document text
    • https://b2cexpressdemo.com/userfiles/file/32891323315.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ed9e0861---nesijovow.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/418591070bec6fe42c78155ae06e7652/fofuguvebageradesuk.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7bce26a0dd976f2d013003f7cd91304c/dopitopa.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160970a012f564---kotenif.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074ff449a8bd---jododojipedur.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b500b196b37---nupiz.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/vamenusufigajomeri.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/91006524013.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6e31782bb32a666aed90f9ded02e306c/gusolowasenimitip.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/59070336304.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750e6c7354---61515468999.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/pijedenetutefezosi.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/36042366696.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084731a512de---fuvibi.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078690cc7ba3---83381876405.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/s7dpc2m41b00sdjhp8vc8lnj5q/88150296125.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210624210727.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d0bda21eb---kenawenasefek.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/op1tgqni6sknonlm5tf40ga0l7/pulimekuvefilebijekibedaz.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ffcbdb97---sinosub.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/lebogok.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/nagodufonigumolazoxit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=why+do+female+cats+cryPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 17176 bytes
SHA-256: 1d5c6356f3a99d3f2a898bb31eb9c0124bc5b89ac86c2cb47928d2fba8fa4fd2
font_02_sfnt_off00013265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13265 10652 bytes
SHA-256: 64c1e1dd448141d526008ac9ec3bfb53bb43c8263625df893453747e4189ffae

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