Malicious PDF — malware analysis report

Static analysis result for SHA-256 576cad040e8cac66…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 20:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08be69245040eae5680cf901ade83b5f SHA-1: 9160bc1e59b792fecfccc33332a1d4d990fe0246 SHA-256: 576cad040e8cac66fb54f1e5a9be9d194e12b276adbb17b37add2b14595963c2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a lure, directing users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=samsung+android+tips+and+tricks
    • https://fallsplat.se/bildbank/file/dejaroj.pdf
    • https://scalping.ir/data/files/file/94194229054.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace1df3fd6---11205771542.pdf
    • https://baigiangtoanhoc.com/upload/files/vodiwijorevefitiseji.pdf
    • http://surveycook.com/upload/tmp/202109/file/58475037336.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b9c2d8ce3b52fe75f84e7c57eb64b367/70639053568.pdf
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/bosetatufifuveretuvugevi.pdf
    • http://wenxuezj.com/images/File/40214166829.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/vuluweso.pdf
    • https://dudikom.pl/userfiles/file/654024421.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f933665cdefbe2444739dabcdba4d4cc/58762247357.pdf
    • https://mauspro.net/upload/files/fovukerovasinurovutofomip.pdf
    • http://gardens-spa.com/user_pict/file/96187583862.pdf
    • https://ismart99.net/upload/files/xevojoru.pdf
    • https://ivanamihic.com/files/61215235656.pdf
    • http://kochamsushi.pl/UserFiles/file/dujemetedivamakunane.pdf
    • http://glavis.biz/userfiles/file/90838069409.pdf
    • https://carolinevlieghe.fr/images/file/ditevebesoketa.pdf
    • https://inprovitargentina.com/ckfinder/userfiles/files/sofus.pdf
    • http://ats-dz.com/userfiles/file/93965391093.pdf
    • http://eidatlantique.antevox.fr/UserFiles/file/pibujupizemige.pdf
    • http://gardens-spa.com/user_pict/file/waxajomipewudaxosifebe.pdf
    • https://reazfarah.com/ckfinder/userfiles/files/zaxabukirexaduwamubi.pdf
    • 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_off0000b073.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 16792 bytes
font_01_sfnt_off0000c88a.bin
4617632f953ebdd99624648fc23d0a4c7e4a4a53171ac703c223f5919f503a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC88A 10944 bytes
font_02_sfnt_off0000e1ab.bin
b3d630ef72f5bd64d165df12cecbc2c7d05bdf52cba1e7e14e62f147de9d4fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 15232 bytes

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