Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f627fea51885ed6…

MALICIOUS

PDF

88.9 KB Created: 2021-06-30 00:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad6341652d409c07302b62ac238b19f8 SHA-1: d9878788a3ce5ffc95dd263d8c1a6c1e93c42fbc SHA-256: 3f627fea51885ed64cec8145fadaf64d3c07ca172c0805249b8de41fbdb0cd0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drapikowski.pl/uploaded/fck_files/file/durefikezawabajuv.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e47ee13e---98613111059.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ga51ml72c4ve2gmgr7ktorq1rb/44387113812.pdf
    • http://rauvuonsach.com/images/uploads/files/78175075775.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6253e23b19d630cde25d699ae9918482/99007293594.pdf
    • http://ghalemdi.com/userfiles/file/zarifub.pdf
    • http://co-mit.com/uploads/files/33823887011.pdf
    • http://ggmtc.net/userfiles/files/sifipekuvav.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1395d3cbc---94506035289.pdf
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/90174621052.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gte5ukaqcibuh65ehdd5i2taab/63503752600.pdf
    • http://osc-pribor.ru/products_pictures/file/lejutugusapisufajat.pdf
    • http://sivam.pl/files/file/veranogenivude.pdf
    • http://salkim.com/userfiles/file/99772846441.pdf
    • http://sllight.ru/design/img/upload/file/lanezokupaxetog.pdf
    • https://angelsstaff.com/uploads/file/zagedosevof.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160851ec01e757---wagonobizejulibepanilikom.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0a4ed626b34a09574da4621041a8f7cd/poxoxuli.pdf
    • http://taskentcompany.com/userfiles/file/depewazes.pdf
    • https://atraba-holding.com/userfiles/file/xuziwesijenumiwulebepugu.pdf
    • https://tecnibat.net/uploads/archivos/99048951470.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/3t3fbunjls9in2rl9ca2h1h8a0/zowajukigozadosofasinanab.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a8178bb3---92580423199.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/snjblcq8cti68b4oa9fjrqb9t0/vivudurikatota.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706412b3e7c---20659140561.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+witches+of+east+end+online+free
    • 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_off0000f54e.bin
b319baddd3e9b34d11b96139be2a7100908b3a21e2fc847dee4d84a094839192
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 10652 bytes
font_01_sfnt_off00010db8.bin
31740b15902539e56ec533ddada60e8cce7cb5ee9d15fa77631d43c6c9f4f7d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 17908 bytes
font_02_sfnt_off00013c31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C31 16792 bytes