Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a466a3c20931a8…

MALICIOUS

PDF

96.2 KB Created: 2021-07-15 18:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c9f577e3ccb358efb03839f7cde8884 SHA-1: 47f16c4965841d17b290cd6574915b21b8b4b715 SHA-256: b3a466a3c20931a84bd68b41b71174e134d70af59f69ea8656cfbf09632820bc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage 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 structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://maternites-catholiques.org/ressource/site-image/files/tupatalusoratitutesop.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fd13e072c---93719365836.pdf
    • http://alvitraders.com/files/58481514111.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bfb2b4334---zanuwoxemogu.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ab8a0df8---zikukomubivisomasow.pdf
    • https://fertilizerproductionprocess.com/d/files/7131481228.pdf
    • http://fabtur.ru/upload/files/sojapujesovizowuk.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/16557391185.pdf
    • http://dbexpertise.fr/catalogue_dynamique/file/murixuvuremawadarigokeli.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/026747c71d44bcad57da1b71b7626bdd/96168652140.pdf
    • http://jfac.kr/ckfinder/userfiles/files/digejibu.pdf
    • http://ankurgroups.com/userfiles/file/vemariz.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072e124e243a---81883048552.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9549c1feb6---61562898824.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607904f868067---7447834175.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160827be9e60fe---70725652411.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2u6lpqqn12h7vem4ftm2i34q91/38946974170.pdf
    • http://shiokuda1.com/contents//files/81113288642.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/agpnr7da44jii5keetqujmehjm/28089028848.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9059ed4b8---radabewaxe.pdf
    • https://amrapalispot.com/userfiles/file/vijufedijosatiruxoxodu.pdf
    • http://www.haztartasigepszakuzlet.hu/pics/file/48074687592.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=steel+structure+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_off000115c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 16792 bytes
font_01_sfnt_off00012dd2.bin
7c227dbad914fb54a2a2d6b650ef1b9488c1656bb249c936fa189ef1a13bc392
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD2 17812 bytes
font_02_sfnt_off00015c91.bin
b265bcaa0b1192d3c8c9a2ae38e150340b22c92acc22570b890a766d6a7a0070
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C91 10308 bytes