Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cf74d1883d21bc…

MALICIOUS

PDF

89.3 KB Created: 2021-09-08 03:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52c588c1f5dc8ad79db7223123ecf054 SHA-1: 860508881c26b13952116d6f88eb2bee3308a4a1 SHA-256: b6cf74d1883d21bcb1ec472e5fc75a0bc70aa29fefaa42d330efa059f4ab0f99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.aadhar-interior.com/userfiles/file/15809985765.pdf
    • http://zzweien.com/d/files/kavagaku.pdf
    • https://uudanbury.life/files/file/45702394746.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5286caf63---67911637110.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb61203c20---bifij.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098311ee9d7f---518798733.pdf
    • http://antasboru.com/guvennet/resimlerfiles/mufutanuteve.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/zozorug.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606fd6db3ce07---88420104399.pdf
    • https://bititechnika.com/uploads/file/wafebifepu.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/l6adrocmegnp3dpsf334f6v9l1/siwojivagoso.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964cb9a8747---vebabu.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c288389b34---48549832377.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/r5bo2k1l5iml1i0m1toigko5ci/niwuvi.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/81299366675.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/33c3b62cec6d675811407541b32d4f35/pipajaj.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857e745c2ee---zegulaborajazimogenisu.pdf
    • http://veterinariacasettamattei.it/userfiles/files/vitowomagefufubofibik.pdf
    • http://afghansolar.com/userfiles/file/68853695091.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/8nofme2tdkgdn5fsmnjh3gla74/72688120299.pdf
    • http://botosani.ro/img/uploads/file/subimenufunig.pdf
    • https://berbagiangka.com/contents//files/bajaritujivuwarekex.pdf
    • https://myphi.biz/nbloom/fckuploads/file/31418143454.pdf
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/puxosali.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=inverter+ac+troubleshooting+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_off0000f7a2.bin
e26aef7a1c77ca438206d25ed1d2b26b674637d0bc2b169bc80678e36865c77e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 11156 bytes
font_01_sfnt_off0001113b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 16792 bytes
font_02_sfnt_off0001294d.bin
dbfab4321087a1764ca25f5af2bbc01f27a2ded2f0f25d6418f834c1a18a9274
pdf-font-stream PDF embedded font (sfnt) at offset 0x1294D 17532 bytes