Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b18f34217f5512…

MALICIOUS

PDF

96.5 KB Created: 2021-08-20 17:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5b82b165816fb0eaa960766b7b187f8 SHA-1: ff230a5867c8e2de5be6d9af97a6dfee672cc96d SHA-256: c8b18f34217f5512e4f062418b890fd22ad254f0598bbd076ece6cadd3d46e58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to external content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the detection results point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074184a2af17---bopagiwufekulom.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0608c27354---10241912922.pdf
    • https://charterboatdeliverance.com/uploads/files/sajifab.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b020c412c6f---66207092116.pdf
    • https://consurs.ro/ckfinder/userfiles/files/22966088369.pdf
    • http://guchenes.com/d/files/30355844385.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b850d6ad8f7---99847472002.pdf
    • https://etcbt.com/userfiles/file/20163058910.pdf
    • http://soepcentrale-dekeyser.be/userfiles/file/raziwalo.pdf
    • http://w-mill.jp/images/file/82406013335.pdf
    • http://studiobaliva.eu/userfiles/files/18432235577.pdf
    • https://akapacha.com/userfiles/file/52996847985.pdf
    • http://naitikfashions.com/ckfinder/userfiles/files/99482972788.pdf
    • http://thepokewave.com/uploads/files/10242353009.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4e69814c7024d8fecd62345c24ec52c4/zokovumutopopabijobefozoz.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8466bc37b---karederojojovevemusowob.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99ea609cf---18305281576.pdf
    • http://asremajazi.com/uploads/files/kiwebazukuwumaxirulo.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c4a58f10a---muduwatomodapikalisurema.pdf
    • https://megalightgroup.lv/uploads/files/falarakomepadesufavi.pdf
    • http://yossy.biz/userfiles/file/pivovo.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075df628ab1a---subitapi.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf89f48974a---92481939476.pdf
    • http://afgventuregroup.com/cfiles/file/16832498621.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=convertir+un+archivo+pdf+a+excel+gratis+online
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdb2.bin
73d4a3f5af4ed839782cf251265fc153794894c9c3452ccb5a36a6c260b8c0cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 17540 bytes
font_01_sfnt_off00012a64.bin
d7d5da5f5dc7cfac41584148f8037e63b68da4c633e0b005c0741584d9f2fe55
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 11196 bytes
font_02_sfnt_off00014469.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14469 16792 bytes
font_03_sfnt_off00015c7a.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7A 16144 bytes