Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4f6a2d8e8f8dcd…

MALICIOUS

PDF

86.5 KB Created: 2021-07-07 08:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 012dc1a5b2c549173bad0f3738cfe225 SHA-1: 3c7bf2e228d5ca5da07e28150236af6fb007b64b SHA-256: cf4f6a2d8e8f8dcd2850eca62a52d4e7618164802184be01b84c47f2db4fd612
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to malicious websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=offline+3d+car+racing+games+free+download+for+pc
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9cdc65f26---luwupotemurebivir.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d44dbcdd---91941682290.pdf
    • http://packturf.fr/files/fivotixiro.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608349d89773b---82256458867.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/973400ec73fefd7cc9878eb7b0510f4d/podajisududixavetava.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ofv8fos8897mqi3e7dirqs6kba/38469832714.pdf
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/bidijoweje.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8ckunmiilkp2cshtf4rk1d9m7l/91721787229.pdf
    • http://euro520.net/userfiles/file/1623106187323269347.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758885a4c1d---72262075019.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859f6fee6e1---juxuruma.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b9d971f1f---80943216782.pdf
    • http://au-coeur-du-temps.com/userfiles/file/59767101288.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/dalunuvuvuli.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc535ea598---rixubonujemujowokul.pdf
    • http://nesthomes.in/userfiles/file/34066940896.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bee4a3a8d766060b10f043903c474c4a/86802313578.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/cp0s4ei6len6dd7q5rc8700v45/56515760690.pdf
    • http://stjconsulting.it/userfiles/files/53545025495.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3eed1cf39576dbe0301c043623cabb99/susimo.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f07124a0be---daraxevirasofew.pdf
    • http://izeninfo.net/admin/upload/files/nixudevijogarofulewiku.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/96757355131.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_off0000ee6c.bin
16b5158b7ec711a62bf8b15a1657648be6103082a5320b8d409cdc6eeb92fe11
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 16776 bytes
font_01_sfnt_off00011a57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 16792 bytes
font_02_sfnt_off0001326e.bin
cf84f7fafce8fc94d54804a624f070414e1df18d5a83b3e52aa9865486ba3e44
pdf-font-stream PDF embedded font (sfnt) at offset 0x1326E 11148 bytes