Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a86b6477ba9bd3…

MALICIOUS

PDF

70.6 KB Created: 2021-10-06 06:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: de19bf1a4cf6477780c2c6954a200561 SHA-1: fa3756ff4bbe4e9fbfe97d2beef3b7ef5cad7f26 SHA-256: 69a86b6477ba9bd30bd4cd6415fc4ac5e5b2ee4b6456c3bcdfee113cce908a49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect the user to malicious content or download further payloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://dcoderesearch.com/uploads/ravokujumuso.pdf In PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d24ea3111a432b47851c6d0a0fca811b/97016584205.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/fejejelepijivigorudi.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/52439637505.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/11147488624.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614aed2f8ff4a---juxusisenupibopajulexaz.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71762622390.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/zivufikefaviti.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/kegidagogesekigoz.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16150bdb40e6ec---baxazujimopowibedaw.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/tetedekamemazutuxanukevej.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/vuranog.pdfIn PDF document text
    • http://falconltd.pl/cache/file/kufixa.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/47764415855.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/sudosigenili.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/83ab822e1fa0c4cb7199c3d728e11236/91269753864.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/misawulojop.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/bomezisoso.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/dexamoluxurizufeguxa.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/76649143721.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/98050729848.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/lejadobenefirajoxitiromip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=formula+for+operating+incomePDF 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://ns.adobe.com/xap/1.0/rights/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_off0000b1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CB 16532 bytes
SHA-256: 1c368f987672b21211f5b521a6132dec8f71e51502a2c01f3bf5ba948c60739f
font_01_sfnt_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 10732 bytes
SHA-256: 4dede2fb0965c29f3e89426411f5dbd7478b0476962d7c9b4678d9fc6d14967a
font_02_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1