Malicious PDF — malware analysis report

Static analysis result for SHA-256 5befeab7a2620a4b…

MALICIOUS

PDF

69.5 KB Created: 2021-09-09 01:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7226574b32abe2056b40282db801585c SHA-1: 98394f4f67d701925f853bcfbd07dc05297c4dec SHA-256: 5befeab7a2620a4ba340da37f7110107a2786a1d345ca8286a056dc18d93e417
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs are sufficient evidence of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=incredible+hulk+game+apk
    • https://hockeymro.ca/docs/file/gewebenagaserafezinir.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64066365283.pdf
    • https://akgoz.zemta.com/uploads/files/rosapidixigi.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7092b8b69424e6229858dd41913d8fbb/95732872111.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161369c2b2181a---63772874892.pdf
    • http://luxlustry.ru/img/upload/resuraredetofadufudivanu.pdf
    • https://yp05.com/_UploadFile/Images/file/62832571747.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/5d99ec6228ee11f4dfeec0a13ab12715/lazenugomogomo.pdf
    • https://vieclamday.com/userfiles/file/nigasasuralefim.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b52c21274---47568964821.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137285c55189---medomotepetis.pdf
    • http://kartywspomnien.pl/uploads/assets/file/71090212081.pdf
    • https://bagstyle.uz/images/file/sajowezalogopodowenelefut.pdf
    • https://aquaprosmart.com/userfiles/files/61874153392.pdf
    • http://fujiya-burbank.com/uploads/files/bepewimesenadaxo.pdf
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/2737594540.pdf
    • http://biznesfishki.ru/files/userfiles/files/burepeginejefe.pdf
    • http://bright-mineral.com/uploadfile/file/2021090412044014.pdf
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/joxovuxelefalovezulur.pdf
    • https://tiguan-wiki.ru/file/23679285901.pdf
    • https://xnkvinatimex.com/uploads/files/sisoxapafikivibugo.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b0d30b5981207d630fbeb84123a02006/92977416090.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c62472eae5488957b268ce4e566f22b6/86944491431.pdf
    • https://gizaviation.com/uploads/files/teginasasezogimokanew.pdf
    • http://muasamhangmy.com/ckfinder/userfiles/files/45343033539.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_off0000b3b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B4 16792 bytes
font_01_sfnt_off0000cbc6.bin
a096083dd7b40b7c22ed62947abf6b140d550ca8cd31611411ec54145fdd8ad1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC6 14576 bytes
font_02_sfnt_off0000f035.bin
611bc5e3843c28f1c16d96ad771ac442e008e58176079900134b491cb7d2bc0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 10860 bytes