Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e2693f37dd8f40…

MALICIOUS

PDF

76.4 KB Created: 2021-06-28 22:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93eab6ef401ad42965c6bba5a70855b0 SHA-1: 731f50fb20979a301b6ae160180d13b0f1e50706 SHA-256: 93e2693f37dd8f40ec6661a7f988772326b3be3ababa5bcadda0b4a89755b547
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple links to potentially malicious content supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://juniorclublivorno.com/sitonews/images_upload/files/ravofegamifo.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac4ee4f108---vomukaxazeti.pdf
    • https://all-stage-meditation.tw/uploads/files/60bbc16ace242.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4f96c01feb405334c28418ef0e96855d/864529056.pdf
    • http://yacpa.org/yacpafiles/file/funokofutodixunegape.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160774985894d5---dufibetejufezokogisub.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9af9e1177e---94896379482.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a2d5eb686---47767350360.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b15424113d8a6acef3150f356097248e/suvizuxifofagolenivi.pdf
    • https://szabobuszrendeles.hu/files/files/22653238790.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/junazuja.pdf
    • http://balogmihaly.hu/UserFiles/file/tudajef.pdf
    • http://mextro.de/upload/files/85270357087.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa47eb1589---23163121023.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/eedff7a6447066931ecf696459ef3773/duzejaposobamefosuzimo.pdf
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/47591456344.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b3d07273c69036b3cae23861278493fc/tuliduguxugatazok.pdf
    • http://kidsjeodo.com/images/files/lekikenaxopaz.pdf
    • http://ibb-online.ru/f/file/90169048283.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c4c7cec586b7cae72f5db30129e96ab0/95190987766.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd06c1502a---wiralinufusenemefetugom.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qh09t927kp7i7d8qidj9vnsgm8/64015930154.pdf
    • http://marasintl.com/public/ckfinderuploads/files/92015713333.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f6f22bc2c863f38c11d041ed15a2515b/zosegabivejipozixorope.pdf
    • http://uptownherndon.com/uploads/files/65374687748.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=coal+an+important+energy+resource+is+actually
    • 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_off0000c97e.bin
f27663a9bfeab61c55617daee151f11cfdc36e67dd0c14e633bac3592de3f6f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 15912 bytes
font_01_sfnt_off0000f294.bin
487a4cb102e7484641f8c21af34ee805631d79254b29dad688c328800306b7e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 10964 bytes
font_02_sfnt_off00010c10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 16792 bytes