Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbde4bc41bda98b…

MALICIOUS

PDF

117.0 KB Created: 2021-06-30 12:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfe93b8bb7c8ee56ddf9130c183478c7 SHA-1: 99f7034281cf721f69b62679495636d01c87f6ca SHA-256: 2cbde4bc41bda98b5cdb19945bf795601fc99607cd30dd715cbefc6bc5de0b24
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=star+wars+imperial+assault+campaign+guide
    • http://kapli74.ru/upload_picture/25245429866.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/69bd3c7c40562f2d981ea6eed1dbdcf4/33839099227.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32418995d3---lelaxeras.pdf
    • http://learnazia.com/fck/imagesfile/99479648266.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc19c12c9---koxabulij.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/62640b5b4ed737acf0b6401e219d9343/nesarepozifozo.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3d1ad67ec1db7226d34e7485d16ba68f/fabubedewulemol.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607633cdd7add---81241742857.pdf
    • http://cfacgroup.com/uploads/FCK_files/file/81164971067.pdf
    • https://sasalidayanisma.org/uploads/file/larunifu.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f955c19ee4---34219238228.pdf
    • https://salvatoredivilio.it/userfiles/file/58527489259.pdf
    • http://imaginove.eu/data/Files/jelatipudetutelebu.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abaeb4a042c---davevoxoxido.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/rf9rrm849dkrl57qpiddccl3n7/32303094280.pdf
    • https://mldom.xyz/web/img/podborky/files/60625567949.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/8go85scaabtanseibcl969hjnu/pakabumorobokurigofawuka.pdf
    • http://poorclarescork.ie/images/ziverisurijoderejezo.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6beb6a3ffe---pimuxakusikegidugis.pdf
    • http://guinyardfamilyreunion.com/clients/62985/File/40382597641.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4201ab67369a40ddfee3337561ac4271/9862795636.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75e217cff---mimabin.pdf
    • http://escqatar.com/uploads/userfiles/file/file/soviwepunuxiwi.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/a112d6c0b9ff6d6287c225f411f502d4/77801463552.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebe9328847---xonajigen.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/oggful7knipd35bf9lrtab21ab/jizoruku.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ea3eef755---naxajug.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9de87a47643b5912c09de56a3591d155/28778079699.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a9b.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9B 16092 bytes
font_01_sfnt_off00015fdc.bin
9e3284e60e892814549660dce03aaa3a1855aaf0e4b3ad6ca07e3d55009ca748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDC 19252 bytes
font_02_sfnt_off0001923e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1923E 16792 bytes
font_03_sfnt_off0001aa55.bin
a028ec3606933ff4e2c8385cd87d54e25fc566a31e542b2492f685ddab666a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA55 11000 bytes

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