Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5129891cae167c…

MALICIOUS

PDF

88.8 KB Created: 2021-07-26 05:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 79054e0eea578addbb8703e9e91fdfb9 SHA-1: 9ab38fa91c46f84ca1cbf102b1cf8a8ad02429f0 SHA-256: 1d5129891cae167c2f2264dfb1ac3a5104ffdef23b496edfb949d88677242f00
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The presence of 'utm_term' parameters suggests an attempt to track user engagement with potentially deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2e168f8b---82073030294.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae88d8474e7---similotifeju.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607dee1118263---91671851481.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/jeremukutulafozotofo.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/23841158958.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20214302227121014.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3ab1cf701a29374dd84dacc33f1921d2/4515168254.pdfIn PDF document text
    • http://olympusflights.com/files/files/zasuduzakaxuriza.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/ragudepaxogemimebigu.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/45339999935.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e347de7df---gigilelodebedix.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/73191561220.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6e88b7b15677a3823b8cc92ca4817ed1/53986112142.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7f5d79a7834583916cab9d01072a86c8/nobazinedujukebov.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89067b425a---61403512777.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/gonison.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0e579ec76d228a1bbe332585068a95ff/92161449371.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/fatazefisulenabujigegupew.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/93581653892.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/44067552622.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/80923627058.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c36add5e4ac---79399628381.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bogu1oogjs0hgm7dhk974ph593/zitubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+pixel+grand+battle+3d+mod+apk+1.8.1PDF 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
font_00_sfnt_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 16272 bytes
SHA-256: 6db0f6aff302517959e771341526719c7cb0bccdb624e9d69e423217ff3f1916
font_01_sfnt_off0000f3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 11484 bytes
SHA-256: 2cfca34b0fac4063db490aaf319b83f1ce961dbbc52c99161107c9a1b7160ab7
font_02_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000126c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C3 17264 bytes
SHA-256: 20231b718989856196149646fa4b5146eb57c79f683d3cab974d64ed6ca6eb7f

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