Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf7263c9443a739…

MALICIOUS

PDF

99.1 KB Created: 2021-06-30 21:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b971852213e303c8cce1d2de50de2922 SHA-1: 2e48cba3a714f404400b20ee9e7cfd79e4a1f490 SHA-256: 6cf7263c9443a7391b13686f6a24b848959b9b1e531c5764603d8935e5ed906c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://market-oborudovanie.ru/upload/file/50905504.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16096e237a7fdb---dizekipomorakilezazafu.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f802cac01---42448760039.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/976c800abc1b31ffbf185d4f13121196/vizuvixeginafu.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/3gte66f30halg8nl07psjtaq10/20512192134.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/vs4humnfpn81vl8utacg3uh0r9/22181561632.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7e59db14366618c9e561f5a924ce4e19/33821263237.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/840fd8b1c9e51f878eca50f881f56cd8/59389469363.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/godibavaj.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608367e01bb19---lidorobogodakasod.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02cdc8540f---77559896359.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2ecb53d69783b1c6dc1b097c0dcacaae/wafoxolasatal.pdf
    • http://neonatal-surgery.ru/userfiles/files/82157728442.pdf
    • http://comp-art.ru/userfiles/file/gefexesixofijiwazubufeliz.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2909921264b8b27a554582c29cd548bf/37929843247.pdf
    • http://photo-preiss.com/upload_files/files/64942497837.pdf
    • http://traiteur-ribot.fr/userfiles/file/52988898916.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/683111433eb753f1af7231c4cfdbf19e/magivebupozijonino.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160dae08801ead---82201624663.pdf
    • http://mega.kz/media/upload/files/97816625889.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/aa37ca1f95e7e5e00d711bf77795c949/31201934777.pdf
    • http://adveotec.com/img/file/15439974678.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=potassium+thiocyanate+and+ferric+chloride
    • 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_off000118c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 16792 bytes
font_01_sfnt_off000130d2.bin
766cad4a368276dcdb12d42b25a3b881ea8cb67817f575d5ef31297c8f516417
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D2 20228 bytes
font_02_sfnt_off000165b3.bin
106b4a8bd03e7d68ff2b77bee827772a5ab5ff8c3fc87e4cb5f705c677644a5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x165B3 10956 bytes