Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1bf3164c4ae0da…

MALICIOUS

PDF

94.9 KB Created: 2021-07-06 21:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7f55872a9d945eb8a21b5eb1799aa30 SHA-1: 9b8ed8a59f323689042373ffcc3e78fcb6f62057 SHA-256: 8b1bf3164c4ae0da301aa10ab6022a469fed0a94e7d150b97bf8f637301f5a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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 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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a035ae502eb12e55a83335ea60cb4297/saterademaselixopibep.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/b1e6c0e392be5800cd05fb1b5481a14d/xoleziwufaridugokifiso.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/xezugipeguvabeviz.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/92728174404.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703a2d1e263---96442338732.pdfIn PDF document text
    • http://svx.su/ffile/file/zedodokekaf.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/jabojapolalobipulusu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee59d0ced0---35392657411.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/71739909367.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b666790c53---56958452119.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607055d76f4c8---sugunilu.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/73605907428.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c0156df5754ecf22f89cd08cf55592a3/posokosifezegike.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ou8qrps1ue1svt7i829kapdb5/91628044469.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/77844262604.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119c38b9fb---dirozevajesone.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/fitepipe.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a481eb23f11---98591166728.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8bc93e2e4---tuluzinalileludexuzodup.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c92f0e451cb3e66355d3271076475d36/bofajaxew.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/tubaleragolatonarun.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/76273389639.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1a2d9fc06b6d8d2037a021fcf2852d08/taturixoxefonufijaruforar.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160899bd75bc12---sisodajowamefufuni.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/518154681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lob+hairstyle+2020PDF 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_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 17736 bytes
SHA-256: 3e799d73c97ffc9bfe96b61542cb57da405798963e5e28aeea8756620c7a0b27
font_02_sfnt_off00015608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15608 10556 bytes
SHA-256: 494c17e76a3b8ffa4ba3b9a5a50cddd43606aff3eb677c0703adbc2fdcbf5336