Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9f791946be5fde…

MALICIOUS

PDF

79.9 KB Created: 2021-07-02 15:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6167e3a4552d88cb5018ccc60a39991 SHA-1: 8698b7566ac52469248c6ddaf01e697d88fb09aa SHA-256: ff9f791946be5fde0dce3f216e4d124b6c6d8cd256146d484c8e0b610c167262
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and link farm nature suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://w-f-l.de/user_img/file/gujevawudukegoluga.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/40091901241.pdf
    • https://underworldgear.com/upload/users/files/poxovixanirawasoxozozamib.pdf
    • https://hotellemaritime.com/hotel/upload/files/zuwamana.pdf
    • https://sportyou.fr/ckfinder/userfiles/files/65464841282.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/n8v44g47j2est9ebbb9fj8b8kd/taviwesumenixosesudivu.pdf
    • http://ggmtc.net/userfiles/files/51407608788.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a30cac0d630f41b95169ba5e3d4c309b/pejuvinewuxiwok.pdf
    • https://al-farh-iq.com/upload/userfiles/file/pafejo.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b1e69c2a7a0f72618d99cf0b6032d5b2/totamiselavi.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/dcf419aa4359531b8d9ac2cb8f6487b6/kovusewawadajon.pdf
    • http://bannails.com/fckeditor_userfiles/file/xodamodifabizadejopevoj.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16076771eb5cb6---novijewulasa.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5046e84ba7d45c13d2cc9cb77fc1697f/98105505145.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a31ed8665---4207682756.pdf
    • http://asijskepotraviny.cz/files/file/14564928836.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vqndlgbd92begp47p8j5o4mla1/nisemugavavifolanoxikix.pdf
    • http://atol-res.pl/uploads/file/filafunodo.pdf
    • http://farmaciafoglia.eu/userfiles/files/xutaxituxopomusidavizav.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f6cd4a8f2---43313383400.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/88230291360.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=west+valley+endocrinology
    • 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_off0000d241.bin
ad9262f58d2aa5e929c8b4a1318cbcf3716d19fb927a685bc18b28b67c15ad6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD241 10716 bytes
font_01_sfnt_off0000ead9.bin
1a4d1ab50977030b9c0ee122de5914de2531cf317720843e2b7df49bf472e792
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 17712 bytes
font_02_sfnt_off00011938.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 16792 bytes