Malicious PDF — malware analysis report

Static analysis result for SHA-256 33578cc5a01b704a…

MALICIOUS

PDF

99.7 KB Created: 2021-07-15 10:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1432caee843c7f7032306b15d59be392 SHA-1: acf12b2c4acd25b2e667ccd07397dd891230d56c SHA-256: 33578cc5a01b704a258c3a2eabcee8178ddb73d71ee9e4b79f23154a5d6024b8
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ats-dz.com/userfiles/file/67543785291.pdf
    • https://rezgame.com/calisma2/files/uploads/74107294893.pdf
    • http://bagiez.com/userfiles/file/xabefuxobigezupolojepimet.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/45166644481.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc0e8396f---lulunawilanepewib.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/rrrqmng08nips1hc4gsgam9ikn/58631630529.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/todisutuzu.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c0ab407dd917722d1b1d6b79e2be8d12/mojovazoxanazuzixomow.pdf
    • http://xn--e42bt3l.net/upfile/files/14177181833.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b65a7b0864---nusimaxatirujotijapofu.pdf
    • http://oreade-breche.fr/userfiles/file/66046798598.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad61c3a8efe---65055139556.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/67gul5kacs2k6u3oor51n0kg22/noxifilagudomukonelaze.pdf
    • https://cvsc.co/userfiles/file/balonameroke.pdf
    • http://abwplazaview.com/uploads/files/ligolukosu.pdf
    • https://aspit.ro/imagini_ws/8468453090.pdf
    • https://paklya.su/design/img/upload/file/tolezevalikitisoxudevo.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/41737771890.pdf
    • http://sdds.be/userfiles/file/pogesopafamuvepapuz.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/60749965555.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/g8marc1faaj1l4htt4vprttouq/13042235075.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734002140a7---sovevedukuj.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/54439221845.pdf
    • https://cplastik.cz/data/cms/file/xafufavatifujafezujato.pdf
    • https://kovtec.pl/eurostyl/photos/file/parazotifapebijavu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=brotherly+love+in+hebrew
    • 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_off0001238d.bin
06d41f028f6d09c9242742e9b44f61722a68eefc8e3117ba1537e1f95ffa0c5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1238D 10332 bytes
font_01_sfnt_off00013ad8.bin
d23c0344dfe8765f8e5c10cf7ccd6bb8a8da99f268b9c50a421562a77e5ee520
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD8 17260 bytes
font_02_sfnt_off000167fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x167FE 16792 bytes