Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8bab64def79e10…

MALICIOUS

PDF

100.9 KB Created: 2021-06-29 00:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 728ed6e25e47603ba25d32b463553a16 SHA-1: 9af650153e7cf9d98f1467932b587a69040929d6 SHA-256: 7e8bab64def79e104891eb4cfc3a1a96e02b87a6e29978183b17f41de623a538
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains an embedded JavaScript stream and numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious destinations. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6b7b6e6e---vixufiziwasafejipavadom.pdf
    • http://atthaya.com/file_media/file_image/file/79155595386.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780954787ae---lelewujatogezeruwezow.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/53925459479.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0512632f48---19994202086.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8615b4f09b---remes.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2baclb1l2u1oiri2q2crktnpoh/52726213055.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/4229154737.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9b054806---xalaxumum.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b466ec79451---farofuwa.pdf
    • http://anhbanglaw.com/userfiles/file/lonofonutaraxova.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ea193ff671001486fb48c8cb13f70bf7/45959429778.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24daa2b32---19889946725.pdf
    • http://w3-japan.com/js/upload/files/wijekokasosip.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/51b178aebf84a950a58d5ae3f0946360/gasebaribosakilijedo.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831a93293d8---natulukasebaj.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/banijeja.pdf
    • http://agendatourvietnam.com/hinhanh/file/bekiduw.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737887845fe---71908172443.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/51562687554.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a1835e322ea5c0a56f1214112f35fd24/70209963621.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=smoked+baby+back+ribs+on+gas+grill
    • https://mediaget.com/userfiles/files/samivagelorowolulosajus.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_off00010e64.bin
1ba3a9bc123a6417b46fa458f9ed84174cf131ec5ba5ff4561fda967feecb530
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 18052 bytes
font_01_sfnt_off00013e23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E23 16792 bytes
font_02_sfnt_off0001563a.bin
de03bf405ac0b2fedfec6c0966de0ffd058abec38c30c410eda7cf656369de27
pdf-font-stream PDF embedded font (sfnt) at offset 0x1563A 11036 bytes
font_03_sfnt_off00016fa7.bin
47e9ba40d78eab6fc75f0484694c3b06904ff1b04431f707d7648ded4d60e26d
pdf-font-stream PDF embedded font (sfnt) at offset 0x16FA7 16348 bytes