Malicious PDF — malware analysis report

Static analysis result for SHA-256 1751edac98f0d02e…

MALICIOUS

PDF

88.7 KB Created: 2021-08-10 17:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3c4e85add872245c1c225bd46da56f0 SHA-1: f40db0f5b5d0e550ea490d758448ed878d27339f SHA-256: 1751edac98f0d02e35d51ac57dc04694d7d91df4a8038cf10ce178d26f8d72b4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple links pointing to compromised WordPress sites and disposable hosting, which in turn host other PDF files. The presence of embedded URLs and the nature of the linked content suggest a phishing or malware distribution campaign. While no scripts were directly extracted, the structure and linked content indicate an attempt to lure users to malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba87285234---20159146743.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/556d22e5296190d0f2cee52e93c19697/zozuvuxex.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd5580ac0---tasox.pdf
    • http://tnslib.net/userfiles/files/28013688155.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c88479e0ccd66e12195d98603ea21eba/risuwikuxowemebader.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10fce15f9---beniwanexosibobiw.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb55334756---mosorurenijazut.pdf
    • http://zjqzzx.com/uploadfile/file/2021072703122573499.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f1d80dda8---13924769066.pdf
    • https://arerp.kr/data/file///begefuxofizu.pdf
    • http://211.129.1.225/system/ckfinder/userfiles/files/88099458082.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/p8po9nk57tb7mrsbe1899m06l0/wegixebuboso.pdf
    • https://lecachet.fr/docs/files/94746685043.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a33b6eff4214cf7277eff7d1eb5f9f68/51364043862.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/rn2g2utlcap63tji30d50hev2l/kojixegaluzefaletijef.pdf
    • http://xenangheli.vn/public/files/gozubux.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2a9jfradu3704317ujdqpm4aas/40648313498.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/povovisogubolavatofowuxot.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/68413301201.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aacce698097---mobubera.pdf
    • http://cualuoiskydoor.com/webroot/img/files/fodoboraduzujivon.pdf
    • https://gerastar.com/userfiles/file/55639280866.pdf
    • http://ridendo.cz/files/file/dilelosazuveraxixonuzuvo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=amadeus+play+script+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_off0000f8a1.bin
3519fb73b1f1a325253c63604db9e30cae8e99bed07a80a4e47fe499fb0f6a6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 16692 bytes
font_01_sfnt_off0001241b.bin
dd7acac800b9b26725a54b7d7f538116a29d59e0e0e61076510c45a42d58e5e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1241B 10752 bytes
font_02_sfnt_off00013ce1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE1 16792 bytes