Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c7979a5ec30892…

MALICIOUS

PDF

81.1 KB Created: 2021-06-26 07:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c34b6cce456637c0d9d9a87162654d33 SHA-1: da9a2b2d363a06b33357757f711559b5d12959be SHA-256: 77c7979a5ec30892a70c72cbcb07483c1a9e4a34754f3133fdccd2dc50523246
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of a link farm and compromised CMS uploads points to an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be11206db---xisek.pdf In PDF document text
    • http://aelma.com/sites/default/userfiles/file/lobubiwutesutujilezuso.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/rupuwejijabifem.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f1b502ca---3587675951.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052516433370554.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/nuvekag.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097e674c0df6---sodukagamotanisi.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/xupulawimotos.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210608_10157755CFAF6018.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad38dee36---28552464045.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1ed6f881776046d8a283b729ee412a73/26782013236.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095edf502499---51749987542.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/ee60ebd2135a31d756a115bdd9539cbd/wobivesejoko.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/jedaw.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/bd11693f5b642a5b264493bf8cd6ee13/80000100563.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609199670d223---4058365641.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/22038405910.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/13843780737.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d68c27bcc2e---18638380147.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/zatazab.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/730b966d357d67b037f839c2fd8e379b/rugepimuxozovinude.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/79435823668.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/pazonabap.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/vafamadepigemitinewuwik.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/rukuv.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/poleliwugilorozaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=a+dog%27s+purpose+series+in+orderPDF 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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 10376 bytes
SHA-256: 6fc24db821a1c6a0c3f1f5e1104338ea14f0645025379a1b0f0937684336cc5c
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 17244 bytes
SHA-256: ec65cd7751d06092b4de395564b4825aa029c1a49afd79045f75d6f8d7fe7acc
font_02_sfnt_off00011f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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