Malicious PDF — malware analysis report

Static analysis result for SHA-256 561b6cb48b5de001…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 23:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de6fa0a476ebea001744993f414d7d80 SHA-1: ba86baa22ee689bb285a0f508b3b7e9247da9c20 SHA-256: 561b6cb48b5de001045d9932cab94b97d42bb794e1cc9d1fe66a2e2f097ca199
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to lure victims to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and potential phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c68e7748e9---31397271188.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/dkvo35k1k3ja7eo9c72jhrrlbi/xadepedikolubibuxoma.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/kkd4b8prrhtls83it357k6eea6/72579105239.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4019aa4e4---lidojigaf.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c9fe227995c7c842773dde22eef64983/gawiwevakilamomoronigekaf.pdf
    • http://brukbet.com/user_images/file/93354911417.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4690a009f---vapufezadixiz.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c579546209f---gumaladomuwodawopavopeza.pdf
    • http://www.anclupnapoli.it/userfiles/file/86871055947.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/08f03fa685baa7963e2de48057d0f948/wefowobedogako.pdf
    • http://amctop.com/board_data/editor_img/file/202105161457.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/17666d438ec55507805425efbf34d7b8/tezadotemafilarawopoba.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4d959a06e544aa759af8e14cf4f3a992/rujapo.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609130f1a256c---biremopijerepuxakuzib.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/58geiqqalleu3b230vmvao2kpd/59901719963.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/40da0s50e2sr1b36nut730o96f/jepinovemizinakanozonajix.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e11f7ed0a---xujakixasogiriwat.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/861a1c284f3c25e8cb3211cfdeba2d70/texijuxevonuxugowuw.pdf
    • http://www.tobywells.org/media/fckdir/file/30941641436.pdf
    • http://learnersdigest.org/userfiles/file/92119176167.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/g4cikpm3ck1es27mem8kadfjlj/bazowobeno.pdf
    • http://indago-rovigo.it/userfiles/files/gigaxinina.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac057ad99ff---nusavozidepawedako.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+marksman+vf+streaming
    • 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_off0000ec8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 16792 bytes
font_01_sfnt_off000104a4.bin
0c8d0c94adc56de976f00712f553c2db3e4f146ff284554ec9612801ad0abe90
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 10616 bytes
font_02_sfnt_off00011cc2.bin
adcfc55cdce74a0f0259eff03a0a34aab33b053a293126d65c641040f1a531cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 17960 bytes