Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ee868ac1e18765…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 14:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81d9edad4af9c07e5633bee0e453c00d SHA-1: 395260944c1afbf06d6b360a6460c3ccd704fbe1 SHA-256: 17ee868ac1e187658311e3aedc2b0883699e2dd0a7589ce2c556c38ef003f8c0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613900d548acd---61834465931.pdf
    • http://abw10thstreetne.com/uploads/files/75439345405.pdf
    • https://bcm.es/files/galeria/files/67887253942.pdf
    • https://consultemergingmarkets.cubsindia.com/files/78859167279.pdf
    • http://fruhmann-elektrotechnik.at/limufekanurepato.pdf
    • http://zit-tech.com/userfiles/files/ranag.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613902a5b3f13---mugima.pdf
    • http://internet-trade.eu/UserFiles/file/91619072699.pdf
    • https://fruitssupplier.com/app/webroot/img/files/batatudumijafer.pdf
    • http://pass38.com/images/contentimages/files/66148729110.pdf
    • http://urdu-hadith.com/survey/userfiles/files/53455031452.pdf
    • http://mazraeir.com/images/upload/files/68477916942.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b158debae0b52c313b819e68caef0564/benozigosivakuxitox.pdf
    • http://carsonpokebar.com/uploads/files/85767969356.pdf
    • http://lawngo.net/fckfiles/26221695625.pdf
    • http://erfaspot.com/resimler/files/96493007805.pdf
    • https://worldmedglobal.com/userfiles/files/jifezogeguzalibufobok.pdf
    • http://www.jobibon.com/admin/userfiles/file/bokiwenagafawib.pdf
    • http://mcap.cz/images/uploadedimages/file/wusifovomijutopalu.pdf
    • https://frontivo.ro/userfiles/file/ditavigetilelosixo.pdf
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/54314120335.pdf
    • http://unite-chem.cn/upload/files/vuvazoxatuxazok.pdf
    • http://realestatemiami.com/userfiles/files/dalubizabijefogatuxivogik.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/saxovetesutixalajedile.pdf
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/62822317974.pdf
    • http://geologicatoscana.eu/userfiles/files/rajebunupolifaziwakev.pdf
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/najawoxomexo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+full+apk+obb
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da64.bin
cf3f5fc712fb1cb66e560666f89f7f1fb29deb1f22e728e797787abe5b28008f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 10628 bytes
font_01_sfnt_off0000f299.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 16792 bytes
font_02_sfnt_off00010aab.bin
4da5bb96c4d4eb68163b943eb08179c9a06c14965f324e5f44208dc84ccef81a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 18032 bytes