Malicious PDF — malware analysis report

Static analysis result for SHA-256 f061db6750758235…

MALICIOUS

PDF

87.8 KB Created: 2021-07-01 17:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e715f54c497b8db27bb1f429406169c2 SHA-1: 9225903953c9a02caaf39cc703dee38938955e14 SHA-256: f061db6750758235ddd910ade384a96bf9e895cc41bbf7ba58bb6ebbb3e81fc1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8cb45f1d89c7b56022e56482c0cddd31/9864692083.pdf
    • http://youngshiny.com/userfiles/file/1624692268.pdf
    • https://poolpoint.be/uploads/file/soninofonosod.pdf
    • https://alatheir.com/atheirwsfiles/file/xonowuxuwu.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/36901588323.pdf
    • http://topcudental.com/img/userfiles/files/sasozunenuguketorewilojix.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e537f8139c62e61ab91d9323bbf5f66a/77850395929.pdf
    • http://braciszewska-klimek.pl/fck_files/file/56025233989.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b82b89432af994e7a0f77c963a280dbe/67669089792.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080363daeb2d---wogepasowitud.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096489f7d2c9---zaraxonozixewol.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900166338ae---zoxarijisidedipiwu.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070818f5b068---35480954677.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/p3lomoqtv4jj1gqhj3elb7obb6/wotobefa.pdf
    • http://www.asslar.de/downloads/puwulijuzowowaluxu.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080aed88f20c---462363598.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16292d7af8---gemageluvirojos.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/sifisetefibuzowene.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abb63424a99---65171575244.pdf
    • http://hcvitamin.com/webroot/img/files/4224912849.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/tut3k1vbupeuu3ivs30ulkcl54/22566789197.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hcvcu4hcv804am1g2chfd1na52/nasomofe.pdf
    • http://czpohledavky.cz/userfiles/files/81783514884.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210601_49897C05E33EE0F6.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+does+luminol+test+for
    • 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_off0000f0cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 16792 bytes
font_01_sfnt_off000108e1.bin
c3dd65f6ea3a707076dc42903d3c56c83fcdd819aba5f6376ae622de5d2fef35
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 18648 bytes
font_02_sfnt_off00013994.bin
a0713db389db2ecae7d7dbfacbdf5973a00e7dd28d029debebffac685fe4e4ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x13994 10712 bytes