Malicious PDF — malware analysis report

Static analysis result for SHA-256 043fa8878cb406bd…

MALICIOUS

PDF

79.5 KB Created: 2021-08-29 09:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddce7d06d06875aacde39ab116c2be55 SHA-1: 2df9432b09c24cb454145c02c67dbe20f236a91f SHA-256: 043fa8878cb406bdcb4fed0d2e446bbb7094a00200de98806367424384d7b8df
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage, with numerous links pointing to disposable hosting. This suggests the document's primary purpose is to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d38f4a3abda---14788559919.pdf
    • http://vinhthuan.vn/upload/files/98159579508.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/48254525049.pdf
    • http://mya1fc.com/files/ckuploads/files/luvipevaviv.pdf
    • http://splogservice.ru/content/file/posixowivujol.pdf
    • https://imotrading.com/images/userfiles/wivifuramotinelixabujama.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/70792790578.pdf
    • https://produktybhp.pl/pliki_user/File/87625675610.pdf
    • http://constantemail.com/userfiles/file/162951522648941580556.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cceafbfa33---jisigabi.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6c509e28ea0a45421cbb2eec77ccbb91/wawuwodo.pdf
    • http://ahchala.com/img/file/68890338650.pdf
    • http://morebricks.com/ckfinder/userfiles/files/vetitosuzapigut.pdf
    • http://decamiones.com/userfiles/file/zokekoret.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/04cff83a3b23256de51b842f0a1e3584/13601282339.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tkhu55lg91cu9rednaj5prcte7/xokuliwukusikuzelepu.pdf
    • http://saimiri.name/upload/file/fivawoxumut.pdf
    • http://yoga-privates.com/yoga-privates/file/ropixepedutesitebijivufel.pdf
    • http://drprdesaihospital.com/uploads/76216571359.pdf
    • http://kulturazebrak.cz/userfiles/59180793242.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610825aa9847b---82619248781.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ojr7nuh5vm8u53l7kmso19neh4/2542709795.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=airpods+with+tragus+piercing
    • 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_off0000d308.bin
f6512c95e6d4bf8c03eea50e33731a2503eaa8e71a8512574f6cc5a3d4dda68a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 10916 bytes
font_01_sfnt_off0000ec22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 16792 bytes
font_02_sfnt_off00010434.bin
bc57034cba6ba334e534a88e3a34bd0cc4bec9a2d9ba998189f09358a46cd4ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 16888 bytes