Malicious PDF — malware analysis report

Static analysis result for SHA-256 8716609692f6bd46…

MALICIOUS

PDF

111.0 KB Created: 2021-07-22 02:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4fec20d3636224cea31e5e623c4949b SHA-1: 2170110a4d17ee08b3d19619e2b3b53fb0ce7a25 SHA-256: 8716609692f6bd46fd66ed817900a9b6ca91adbf89780535590368122676130a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure implies a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff1405b4c3---78164728555.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8734ce8f5d---22355587652.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47bcb040c1---kerijawej.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/begolesama.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0kmfabmaqt4vkhp0nosb0qbhk3/14493391874.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca262e79b---nenofonovobesuku.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69136681484.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bac97a8cbc0---80140257480.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/47914967971.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73206532443.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700dbb2097e---teponofibedatonuju.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/20492215909.pdfIn PDF document text
    • http://usmleworkout.com/files/file/28277449098.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/34096486647.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9fgld48c0b73t4bkl2salp96ut/98712375870.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/52060332667.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/mizereduvelade.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nc6ac5ecik3be7fc047tsiabv3/29670079800.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/4063726408.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/radadufuzojovate.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/hvbrvv7o6o3tndsclclgr2e1tc/vusekuxada.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/27224663295.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ff0d0a228---69306341478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=little+shop+of+horrors+jonathan+groffPDF 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_off00014f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F95 10724 bytes
SHA-256: a7013f1a79a9cf8aae54c6636e1d5fea41148d8d9917d7a28ccf7ef302e394d0
font_01_sfnt_off0001681e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1681E 17296 bytes
SHA-256: 8e499c3f8c15dd66b07627dc2d429ead1061df633e164512260e2083344d7741
font_02_sfnt_off0001958d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1958D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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