Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4b85c0b25ef90c…

MALICIOUS

PDF

91.7 KB Created: 2021-08-19 19:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6e281790adafc7594b7a3435d953ffe SHA-1: b30e79a60c425f8d5c70e7a08cdf43f1fafff8e7 SHA-256: ca4b85c0b25ef90cf016bb154d1dbfcbe1afa648e4daf4d18a9b8fd1918f1e29
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The presence of a 'visual download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely to deliver a secondary payload via one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6ed2641e3bf44cacb33c109b433d693a/vakedozawevokanimagawufa.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/de1e49006fba93be4fd353cfa6842a35/66132221044.pdfIn PDF document text
    • https://riwg.in/userfiles/file/janetodasapijixiwuvupes.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/tozofubazirulexisaki.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/52064523980.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4d24affd---getojanasasinodibej.pdfIn PDF document text
    • http://dentherapia.hu/files/file/12962106321.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/gepowisi.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/98783074240.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/55329195.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/91092857783.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/60392397201.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9353eae875---90563405375.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/81008145707.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608224c4c6f6c---bebawi.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pfsbhctc4b074gp52fr98ojtkk/92580192444.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5e7d071e---jilarenifiwosereratezoma.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/93542672517.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/zawazekivu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd6d3ba051---gokabozuwikibo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610adfe307b2c---55236558807.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/zinugeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fl+studio+12+free+download+64+bit+highly+compressedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012eb8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12EB8 17172 bytes
SHA-256: 29ac02631cd2cb4079c8a8557cc555da179a8ae92fb0abf93268582c8662de43
font_00_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 17288 bytes
SHA-256: 1244ce0bfff8213bdc3a1f93d3499b00ce2d36c80a64f56d002c8d590cc4b9b3
font_01_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 11900 bytes
SHA-256: 3dec863baee159b1cb23fbee60cfeefc3323f4bb37246e4586940d17661e2382
font_03_sfnt_off00014855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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