Malicious PDF — malware analysis report

Static analysis result for SHA-256 a503c32bd11f4fbd…

MALICIOUS

PDF

88.2 KB Created: 2021-09-07 16:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d7e22bd1c387551e2eea58e5efa7f8a SHA-1: 8aaa7f38d79281798f45a46b396640e2301f5c5d SHA-256: a503c32bd11f4fbd63f35fd99e5ba83c991aa30a6bcce2899736e290f10d81b8
196 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a LOLBin token sequence in the document text, specifically 'cmdqpg6akhss8s2/xovosorefonuwog.pdf', suggests an attempt to disguise or execute commands, potentially involving JavaScript embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://wwm-quanta.com/upload/files/24996095409.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b987c5cd325---majumugajep.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/kametumakosep.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/davoteximenenuzo.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2uqpg33vuoscmdqpg6akhss8s2/xovosorefonuwog.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/80599771062.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55774c9b3---sulogesugir.pdfIn macro / runtime command snippet
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/94138272890.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/9gph6i4sq369kpi3ophdrfe573/vijuwaganixopofibosarosi.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/98756503613.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb92222f6---68510574913.pdfIn PDF document text
    • http://htwy.com/upload/file/75368750721.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/h0mlec7kdd14ge0f31ia2geie6/63277860805.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609db7118d0ab---sesuwuwisavujawuzifele.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/20771333383.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/56403559659.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/99709630026.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b8445cde1821af6aa7128e62a60f2cd7/ximudekavalefanogukud.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fbd1ef351---sudawoja.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a66c2774---89651033685.pdfIn PDF document text
    • http://poiskvod.ru/images/file/40499182724.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/43224781224.pdfIn PDF document text
    • http://mawaevents.com/upIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=detector+dog+a+talking+dogs+scentwork+manualPDF 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_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10992 bytes
SHA-256: 95604c114a95a0aed06bab828af9a7f68f80b14c877b033f32ee7a2e28a7f847
font_01_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 17960 bytes
SHA-256: 17c794e972635ca656bfba27d251b33d70d9553a1080b58288bf83f2736c8317