Malicious PDF — malware analysis report

Static analysis result for SHA-256 b616c5cfb105d99e…

MALICIOUS

PDF

92.8 KB Created: 2021-07-23 18:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d560b54c44973ff69a276a568606cb69 SHA-1: db4abf7a7b311c34ae6d126cab8cc4293ff132c9 SHA-256: b616c5cfb105d99ea0ff1b4728ed5ad35b5d79c43cce95ed4ec65ad40d685688
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers also flagged it as malicious. It contains heuristics indicating it's a link farm pointing to compromised CMS uploads and a security bypass instruction to disable antivirus. While no scripts were extracted, the presence of these indicators suggests the PDF is designed to lure users into disabling security measures and potentially downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5c419f076---tawafadifapipexuxowerefud.pdf In PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/kfjhvab4rqtpou74dpm2vaqnl2/18647616723.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/87036917937.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/23249355174.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e5e4a3eb27afe35de9b952b44d6f9903/zulavixajerutefiwebase.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831c1ee58ae---94168171486.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160985fb39652c---nasaf.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/gedavalixofazabojimev.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e330aa44f38---48864369675.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/dotegajoxegu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c51607a2---xebiruwetofibapizotip.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/keruguxuzudosil.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/40360573331.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/893bcb350add308484a6238add620366/jegasamuramaraduzemazone.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53e3172a4a---90118436521.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/gulozigukijebasuwiruju.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609071b469bd8---neponofujejap.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2014362258c228f5a21dd2f6f6484b15/xotesugilewun.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/62186529751.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0ce62833---bizudegepubevivibaterenit.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a60e0dc5b9a---logenikidijadoziwir.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/74b7ebbe12a75f1aa652a6c3329176c2/64170850293.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/624933660482c1ad2eaa8775f92eb3d2/relaketusomekinadajupafo.pdfIn PDF document text
    • http://axwelindia.com/uploads/39012672416.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bf9a82538---86173130422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=rocksmith+2014+dlc+download+free+pcPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/15058065652b9ea962e0745dee4a9400/47911583142.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://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_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 17932 bytes
SHA-256: 0e683d87b57717ac848ec66b5806d0f125a9b84a79f1b67c007b0203cc68df28
font_01_sfnt_off0001343d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343D 11480 bytes
SHA-256: 2ac9d6fe972bafd58c36941d672ca0a665b233be175a7a362cfd89f64e894ebf
font_02_sfnt_off00014f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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