Malicious PDF — malware analysis report

Static analysis result for SHA-256 c476e0f7bcedbaee…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 04:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5569d5d2a6bc868dc9893700e72cdc2d SHA-1: e4e0c0b8cef08e91c2fb015c25d5c07c142dce65 SHA-256: c476e0f7bcedbaeefc51b60e63709bcf2539dc039d46be0f419c9fc393d87b3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://flatadministration.com/uploades/fckeditorfile/bokifajubunumoradafodux.pdf In PDF document text
    • http://myapartment.de/web/editor/files/zusesosifino.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f177f56603---waluretupadasajetev.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e1dbc8c3b27---rebagetonebisojitekeputa.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/58838153391.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610812f92fbe8---87902461914.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/27dfd125b8567b7cd2c76051c174ba20/jaxavowobajabero.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/68288331479.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/xixadedematuzuxisipiwik.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89d6a672bb---78410699670.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/lijiwifelexolesorimowab.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/de75184963778e6aa39d1f5049b32743/baxowixisisukawujuwevexo.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210821230536_bm9wli.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/sodin.pdfIn PDF document text
    • http://nature-revive.org/files/file/leguzapofesegiximegugipuj.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/69399494777.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9f6491ba8---gevin.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/zinawolodujizo.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/gusiwilejonevelilis.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/78996462735.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/guvugewikejiluvuvazopemip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=livre+droit+administratif+l2+pdfPDF 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_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 19844 bytes
SHA-256: e52e43c6e541a3b0556f9b9d49b464e9250e34b0690949d58234a7188c9ca161
font_01_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 10804 bytes
SHA-256: 21c381b2f5e709be3851410444b0303e6a4c5deeb00c5a16c807dbd352ed60b9

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