Malicious PDF — malware analysis report

Static analysis result for SHA-256 40356b9adcdee6a0…

MALICIOUS

PDF

100.3 KB Created: 2021-07-04 11:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c62cf66ec0fd724d0c12f2bd6734e2c7 SHA-1: fdb0978a4bf812d9bc3c24fda478a42ee75aa98d SHA-256: 40356b9adcdee6a007d518ba49d52e7224b2b16f8ba6581dc73555d9a1f21800
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves a malicious purpose. The document functions as a link farm, containing numerous external URLs, some of which point to compromised CMS upload storage. This suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://iccarrentals.com/files/file/gewol.pdf
    • http://agro-vostok.ru/userfiles/file/jikib.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/zesunurolex.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/o8vlc6ferca708os6caqdb7kur/35001115184.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdd9ff4f9dde36064a711671caf15e08/67261148962.pdf
    • http://vds-construct.pl/userfiles/file/dinesuranakume.pdf
    • http://alliusie.com/userfiles/file/34404443642.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0242b71ec---49183716595.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89eef38d73---ruzutemobe.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091666ac07a4---bezupanazeger.pdf
    • http://galantemontagnana.it/ckfinder/userfiles/files/70793630748.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609658df24621---revujop.pdf
    • https://liur-krd.ru/userfiles/file/77367307598.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/461076a68ea60a792899e5f482972064/wijejurivenebipukam.pdf
    • http://beautybybelief.com/admin/images/file/xurofajedoxadojojij.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81f46fef6---92073211567.pdf
    • https://callmarkinvestments.com/callmark/files/40867559067.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160abb9249430e---64581183470.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/i6oqqoelrhi0592hfm5hjtkngf/77336151398.pdf
    • http://lagunaapartman.hu/images/user/file/derenipakuse.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/1264b26201e44b5187e8e806df1eb72c/65823576755.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/64bm06eg2g3g00ol0dbnbtfjc0/texapebuleriwalul.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759e2121822---22856937052.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d473b97b18---mogabimusovige.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/11a5f05641847073788e195d03fbcfdf/bobelufegelavuvuvupudi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tangent+of+a+circle+example
    • http://s292376414.onlinehome.fr/datas/imgmail/file/49286182207.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_off0001217a.bin
157fc476c61da1455a1a3bb4db86fbb9934a0e9bc61cb284b5cda2284f89bbc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 10720 bytes
font_01_sfnt_off00013a13.bin
b6a47aafac9d49979c524b6b8ea2334551de8657e7fba12ea1e8f2b59757d6cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A13 18588 bytes
font_02_sfnt_off00016bff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BFF 16792 bytes