Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0a8a78b7ddea87…

MALICIOUS

PDF

94.9 KB Created: 2021-07-04 06:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92ca10c6a53b8d6a74f0626401aa3b53 SHA-1: 654307f9f626f0a8e695aa4f6a2250b60bf33325 SHA-256: af0a8a78b7ddea878a37dadac4390d9af3304a96fbd9c0084c04e08c5f9a6135
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://philabc.ru/uplcv?utm_term=scattered+meaning+in+kannada
    • http://sciattella.net/images/file/54912711321.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608f987cd6c98---68046367057.pdf
    • https://matskaren.se/anvandarbilder/203/files/70507690501.pdf
    • https://fanaf.comarticle_ressources/file/zobimaladaxof.pdf
    • http://resetimpianti.it/reset/public/file/wezufufaruzunitoberubigas.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ira3q721v5aa0g467ig19gevq5/kibinulivufuzisabidivu.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81dd98e213---85387245039.pdf
    • http://guides2alpes.fr/uploads/file/81349780353.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/i36nf2jo3qq9fd63du3dbk0mid/temew.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c0d026a5---61615621891.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0cd2611cf---zimojevujinunabikarofuju.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9d2c423574f7e594a086840c1004759/kimaguwokuvevilu.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160832ace9851f---73001953038.pdf
    • http://ruresept.ru/files/file/2853505563.pdf
    • http://csc-020.com/userfiles/file/20210701010943_9pydvi.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/95q6a1oq7oor3i1pjiqeos23ia/lijamomul.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/m3cq24l1tt0vnc16kkeq913iee/luguwatixusuralemugu.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f95d1b51e---95111298764.pdf
    • https://aslimitada.com/userfiles/file/girezekavojeleki.pdf
    • https://nattasampun.com/upload/files/sedolejidabevetoze.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2a0809d6a41187f575aed52fa1104c2d/lilumuxilolibutuvil.pdf
    • https://nhachoxebus.com/upload/fck/file/nibevavu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47e.bin
3cdf4f8f4dce7a464fe4e8ceb6988aa5bf7bbea20165803f235b519784394ddd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 16524 bytes
font_01_sfnt_off00010ba7.bin
bbcce815565b9506d1b5aa69a1e27e8d40f942e7eb7a7b1ac33e9e63580f78da
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 10548 bytes
font_02_sfnt_off0001237b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 16792 bytes
font_03_sfnt_off00013b8d.bin
397f07de49c23e06d3ae4ce39a999f1eab3b6bc9dd343391f77dd4a16997dff2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8D 18644 bytes