Malicious PDF — malware analysis report

Static analysis result for SHA-256 595ddf08ec2f3ec9…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 02:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c50d350d4c31472fb83ee582b989b9b2 SHA-1: 00b2e5181df3ce5b7ced5b1070ab627ac8148908 SHA-256: 595ddf08ec2f3ec9f8354037df0dbbfaf1f07bee4a71f052ad2e5feb58c37c22
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-distributing sites. The presence of a link farm and the use of compromised hosting are common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://benrassam.com/uploads/files/24626189578.pdf In PDF document text
    • http://www.bufolari.com/public/immagini/file/88186068347.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/laxekanogi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160864cf14a21a---39195193496.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/00301e59c0dc7e3fae060cc02a56a3d3/mesokilug.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/23375389210.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/31833188443.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/seziro.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607935a4ce0c7---jewezusikon.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee55023b83---dulupiwigufevoxumaxi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801b8a4ed4c---novesike.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/19229332858.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9cb003ca9---75864827627.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/wuruvoperewe.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160abbcb1534b9---81533235633.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mlqs0o99l5shlrkhqr3g5fgafl/17009037117.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/26198666069.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c295d9409b7a8fe6d9daea52f3429ac2/59358336263.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tua4jmtgt5u1ag7p5r2radevqk/15267857777.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/najepabugafefaze.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/24569513434.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/bukejoxafot.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf46cf62a09---midubijajofijudif.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/1957004087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=backwards+manual+bmxPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC492 10664 bytes
SHA-256: fbdcfe59eabebb86e9bbcad497d5db16191eb8c3b1e591f037d7b867cb173767
font_01_sfnt_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 17292 bytes
SHA-256: 99ac23aee64a3a863b4f7123290cff8533e26ec9a49698513daff88a2a39c612

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