Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c799c0dd779d45b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 08:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1cf8c676030af29b440900b88bbbd9d SHA-1: e2de93a4118c532acfacace9c5572a25b958d821 SHA-256: 5c799c0dd779d45bfe5859f038d45087f192be711b233a800987e9675c6d944f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. The PDF structure itself does not contain executable code, but its purpose is to redirect users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3ba99955365ba773ad336c8a44760e9f/dupobarozefulofewef.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b4cde022c08eca59eef7b7070921b647/85091269082.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf42333d84---livaju.pdf
    • https://termokingbt.com/ckfinder/userfiles/files/60210518499.pdf
    • http://dui-antidote.net/images/userfiles/file/22968810781.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612acce08b2b5---nilobipixunukoge.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba53a494a9---matupuwo.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6ac9888c251ede8dd0c5a27671de997f/zemawiwoxotuwetomulomif.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951ed47894a---kojoxipefuga.pdf
    • http://pritchardreunion.com/clients/81409/File/1245734118.pdf
    • http://boxshop.mn/userfiles/files/42852999542.pdf
    • http://hysansam.com/fckeditor/userfiles/image/gelopaxedufez.pdf
    • http://englishplanet.info/ckfinder/userfiles/files/daravuwoxedoseb.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104d1d3de599---vaguze.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/97320b33c66781863886dea628fbe494/devoluduluxeredivamo.pdf
    • http://abogarestudio.com/userfiles/file/59050591436.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d072ad30294a81d70b807117966bf615/21376685511.pdf
    • http://cuacuonbinhduong.com/upload/files/gekaguriwagapi.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/lakamiwowovizuf.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9952a403f1---35823581709.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/gosawejoziraki.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0102dc75a0---murawewipekimuxosuza.pdf
    • https://educhina.mn/editor/files/gawadoririp.pdf
    • http://studiofagiani.eu/userfiles/files/67294924611.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+convert+pdf+file+to+word+without+any+software
    • 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_off0000dde6.bin
9697c11a9a21d3ff502d576faf8bf0622fb05dc40bade959aac4b7be2f559fa2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 17348 bytes
font_01_sfnt_off00010b02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 16792 bytes
font_02_sfnt_off00012319.bin
43faf0f80b11a550d5ce6c71584c397fc4690152bf08525b8baca5a2d98b6698
pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 11072 bytes