Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fddc5975f624aba…

MALICIOUS

PDF

91.9 KB Created: 2021-06-30 00:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47b2f91f71d25b28de7226398dddc445 SHA-1: 024e7c46e529d2e772a3a13b295b4bacd82e165e SHA-256: 7fddc5975f624ababde03377c6195bf4b077d236c1d23cb0248e76a110088962
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple compromised CMS upload links suggests a pattern of using vulnerable web infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ffd5c2314e83e172154371c4f990b858/xexofuxujipo.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a22f397b2d---9742939287.pdf
    • http://ayhancevik.com/images_upload/files/mopajinufogud.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160830303a2551---kinefolifizijukevo.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071a73f28c32---91270168656.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b262df423---lenibo.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8e81def6c86b22a82fa61b79db0a3d85/tigojanamok.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ctqk1v3thk6ddsphg46j9i5gda/93880509821.pdf
    • http://global-insurance-broker.de/downloads/46870854197.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/nuzutubujopifamu.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/piwiwobexovitifipagadi.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b273549e---27455750090.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/2654dd82ad6c44e941fc965f5a8d7f1e/zobofotufafogavubisos.pdf
    • https://mfdesign.hu/files/file/74078347771.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/da716c17d72388bd26fab910d90bbf62/99149581716.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/zafikuvejomerovos.pdf
    • https://alakharia.com/public_html/userfiles/file/42894272703.pdf
    • https://foodphotoshop.com/userfiles/files/daditamufekoxugaxix.pdf
    • http://makesomenoise.hu/upload/file/vusedovunum.pdf
    • https://angkortaxiservice.com/userfiles/file/jelid.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/7pjb4psah34tkpskmcj6o74pue/6863531038.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9ca27560d02be141d26952e6ad45f357/91302680786.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6691f43d41---xazepajikofipumibe.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/44148066188.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dynasty+warriors+6+pc+download
    • 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_off0000f09b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 16792 bytes
font_01_sfnt_off000108ad.bin
0f1e9c2e7ca959532bf9d1aef3543faec608e03d95b5192aed8e5a8976dff164
pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 20056 bytes
font_02_sfnt_off00013c3d.bin
26157f00c0e8655ad4db622541efb1b168e510d008346d706129cc20e004cdf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3D 10744 bytes
font_03_sfnt_off0001551f.bin
89330883169ebb2cda71fd68da88b80d4debf2d0679d290cd66f19f1c4585337
pdf-font-stream PDF embedded font (sfnt) at offset 0x1551F 2620 bytes