Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f99cc4e75ac7290…

MALICIOUS

PDF

112.8 KB Created: 2021-07-07 14:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 713da86b33a7c045ef0e8cb7765ed8ff SHA-1: 94ddd19a3ae1ec869b4eb8ea27b58728ec9ff07e SHA-256: 2f99cc4e75ac7290525f688926fa6f967d9e6f50266e2f438f33e8fdaf881c02
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://pk.mo/userfiles/file/fupopiden.pdf In PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e22fe51ed7c4cf67610a279ab37a0fef/nofizeko.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/33643927213.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/60154009854.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f09152007---9496894078.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/536300dfeb85c2f4d6295a10e21bc99f/jupekag.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/widarakomiv.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/93224669799.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09901521a---vigotikibebubidufagepa.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ab954673---mexolaxugijazotekafureme.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/86025095738.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/69e82599afe998e0e0366e95a0556262/dexafu.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/silugomube.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18362071913.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a977ddb8---kogifuxijojuzapanot.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/40246248907.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/08fd58ce82972335080cc81f4ac495c7/konisolefijubegov.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/bazefisukalebo.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/90933899812.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/0923afbe1d47899830176973d86c3fb3/bajuzuj.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/logose.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160824c3c25e6b---36027007831.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/82858206509.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/17115119243.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607affdc85cd7---golul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=international+journal+of+medical+studentsPDF 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_off0001573d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573D 17692 bytes
SHA-256: e409e690d5c429ab47a69e5991e4f460dcf1a6331307ab14cf623218dd603b5d
font_01_sfnt_off000184d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CEB 10820 bytes
SHA-256: 4025abb677ef60ebe6cb130a61e80a7b3d7006edb48a2af2672aa774d41ed2d8

Open this report in the interactive analyzer, or submit your own file for analysis.