Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e35df24fb61cddf…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 20:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db18217796c436040aa1c6e3cc9d7256 SHA-1: f5b14300fa2b4c44160c0399ad35c6b8c4fe410e SHA-256: 7e35df24fb61cddfd51dc217bf42ca4063623425c1c1957431d02fbde2c9435d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to other PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f2ed4a9f4---13855517742.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/moziguzujapomumepekom.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/nhidi1v63mt08kc6aa6uabtk20/gaxumisowodimiporutuk.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/176c336b46acbb04f5f767a28ebdd0db/radavetisawome.pdf
    • http://muszempilla.com/files/file/wazugomesun.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b4981406ecefa70364a1deba05b57d63/71144539310.pdf
    • http://wintec-samu.hu/uploads/files/kamagejepujokisopol.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/37521286134.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a107d691a20---78245771769.pdf
    • https://prairieroseclothiers.com/FCKeditor/file/roweweropamagasuduruxewe.pdf
    • http://centrumbiznesurawicz.pl/userfiles/file/lerijur.pdf
    • http://4grd.com/cmsimages/file/xasepawofop.pdf
    • https://susta.vn/userfiles/file/87633201375.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/bed3d1647d4e86a1f9eb79c16c92ad0b/47026718244.pdf
    • https://5uempat.com/contents//files/66250706469.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a646ed5994e---11147676374.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/uk2q3483fqers2i3tu7bq0nn1a/31650074591.pdf
    • http://yilip.net/userData/board/file/ripujodavizo.pdf
    • https://securityguardsupply.org/php/uploads/file/sezabatalerexuvabur.pdf
    • http://beloezoloto.ru/userfiles/file/dogajolo.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16085b5d8861c7---javabopazaxonijos.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/25205676a980b41037d454c5e2732848/likigifipavawivediba.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a65edc1ad97c5bf1624b2d53d70aa546/kavapixofumenawawonu.pdf
    • http://taitung-house.com/CKEdit/upload/files/zexerigebojebogekumimos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mussels+in+white+sauce
    • 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_off0000ede7.bin
6264e7478d8e6dfa3aab41c28f49de0c6a7a5ee354997e1f84f28b30d51397e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 10288 bytes
font_01_sfnt_off00010509.bin
1487a2d5238b22ba680c8f9c255e570df12de0d7a52c4edec853a3034b40ea5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 17196 bytes
font_02_sfnt_off0001322e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1322E 16792 bytes