Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ec614cb75aa829…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 12:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92c0a05ddbdd844b1d3c6a50f977a6d2 SHA-1: d4cb91a87b9cdbb46851ad5b1dfa041935057060 SHA-256: 32ec614cb75aa829f3b3b23ac72eb7558f62d8a3890f380685cf6b04c13e5206
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be junk data, indicating the primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://laborke.ru/uplcv?utm_term=5th+grade+end+of+year+math+test+pdf+go+math PDF link annotation
    • http://soncongnghiepjotun.com/media/ftp/file/wozunamabubin.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210830105024.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/7117519789.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/daretixaberiwiz.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/39bfd7a894979553042bc9c4f2403a66/jadobefizebovoxasitelu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a0deaee6571dc79d026fea36a8a86102/68800927221.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/kafekifojenari.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/11785267792.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/tumekekexavezoj.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17b027240---xotuvotigiwev.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c5628909f373c32465c550f1ef88b717/4630479801.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723313916c3---42406326216.pdfIn PDF document text
    • http://premium-h.info/files/files/99743224015.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/8945b2fe446c8528c8ce59e5fa757a63/sifunexonunipojamelewugul.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/vudexareduvemipudozegotos.pdfIn PDF document text
    • http://sushi-belovo.ru/files/2885359455.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f529bc63ca---betojozexinigi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/v8ejap84tece70qu4j3jvsvane/62716657953.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079c10262810---gawojuxuwejevo.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/tejodi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c47fdje3uvk64cd6sqov7ibp2/fogosad.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46bea4ede9---xadopaxoxi.pdfIn PDF document text
    • 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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 19076 bytes
SHA-256: 3e508c2fe05d3e6d2dd736de7ccaf3754998ce03199b0c70e7cf3d483778bd97
font_01_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 10956 bytes
SHA-256: c53a0ac8b61af943591651d763c7876de3ccb313a41656dfae8dff1c9d0606c8

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