Malicious PDF — malware analysis report

Static analysis result for SHA-256 807224a713781217…

MALICIOUS

PDF

84.7 KB Created: 2021-10-06 05:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 97aa37d8080feff95375287ae99d233f SHA-1: 7baae0f050e4870af631b96315377c68a0c182d2 SHA-256: 807224a713781217354ab4bc6265b842c1cded79fd0c9e3475bdec6dd36efd31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=is+french+easy PDF link annotation
    • https://riolospettacoli.it/filesUploads/file/73811593371.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/18395315219.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e29b25fd2d72aeb6968f6a7e6fd80e74/visobap.pdfIn PDF document text
    • https://5974293.pasarantogel.com/contents/files/vezolowo.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/wefexitewa.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/79736585435.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/vubibatejutavedazetumu.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210915153853.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/45193785147.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/xobenimonuzunuxagoz.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/80707599594.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/103fab0b9e339c6b5f6c289b86373017/80842784335.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161597de5c8a80---69949864634.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7511b591d---noluzow.pdfIn PDF document text
    • http://korytnica.net/data/files/jusibunawifal.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/xemozobowabajirusa.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/degezagiforotoxep.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/31732428290.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b8b275a71---zonanomalidetepixot.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/8893954829.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/gebotimakuxuxijaxubuwizan.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/vonosemivutemu.pdfIn PDF document text
    • https://felicityokolo.com/file/40155989685.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/zawapixuzipibon.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/42055067159.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/xitajuveburabubezites.pdfIn PDF document text
    • 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_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 19200 bytes
SHA-256: a32218322678894bb899a236e2804490a246bdd8d1ece35eca211b95cf369b98
font_01_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 10144 bytes
SHA-256: f4fcd908ed28d8fe2563e3560b6b034498e0541d6cde51e7c1b50d2ab8772d25
font_02_sfnt_off00012d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1