Malicious PDF — malware analysis report

Static analysis result for SHA-256 86958d7923f87447…

MALICIOUS

PDF

84.9 KB Created: 2021-08-22 00:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 444caa8296888d1cf1b10f4d1800bb49 SHA-1: ee82b58519e25e069d7a3fb1d8412dd198ef7c98 SHA-256: 86958d7923f87447e86c35a9cf729335a1da9d852b8743f519778aa4b93771ee
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with many embedded URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of instructing users to open a password-protected archive, which is often used to bypass gateway security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2623bb37f---279497055.pdf In PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/20773896826.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f133a2c8---rekanopuvisenu.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/tivadamemut.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/54554860224.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/92126188483.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/80900752127.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/27764056528.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r43o8vfnqj0ie3g08dncg1scic/95578435919.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcfc4c18cd---55657466976.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/99474304471.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8chsipah46714571dks2u46mr2/fenodijade.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/deeef58df4e4db44bdba7a45a4158aec/kuvugubadipatapabibubuf.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cfelks2099110dqjbihtoefop4/wekefes.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/vagiwaferuf.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/18442464706.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/30707510808.pdfIn PDF document text
    • https://aitalk.vn/upload/files/95646408188.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/67150410637.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a99ff291623ee7c256eab05d9ce8086f/17144017684.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/90e3efa32d8f2412cf796ca234ef7510/dogat.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/deravuwewov.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/88592393844.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/79323961535.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/59403776121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=spider+man+ps4+ppsspp+androidPDF 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_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 16952 bytes
SHA-256: f11bdcd42855968a7cfe5539677d44a23f624f5dbd351e1a552e61ce086a8a4e
font_01_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 16428 bytes
SHA-256: e779da89c4bc12df717ea6b5f160c5be94e3ed54378b6fcaa46a7a760f0746c5
font_03_sfnt_off00012c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 10564 bytes
SHA-256: f08a72692b479e2529173290f5195c773fdce8eecd574f976101d7a904240e65

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