Malicious PDF — malware analysis report

Static analysis result for SHA-256 26688417e1119465…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 12:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd9c5fb1996dd71ee424288f6e131c6b SHA-1: d165b8125cd34961cc45b4da90a144b881f1c766 SHA-256: 26688417e111946566e01f60fad15f3a8759d049a178200cc2d6c2c694f925c9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm or part of a phishing campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest it is designed to redirect users to potentially harmful websites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607007d5aa596---96789987995.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a668b33e18b---7291891571.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/nesaletofirepumip.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611b2bb3b8889---nusutilomodefudoniv.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/vekagibamumerufaze.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/597bc05fe3172b3d4af020786e722630/mijoboxarogesemedopaxezo.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/70528239598.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5f35b9bff---6818755595.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7c03a033---56805681053.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/14517032308.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/907ca29440f0b5f366d9e7e7c85022b6/firekututanomutinuwe.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/vexabujawowijoniba.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/75203629785.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m4aorakq46c4el7si5edjtdv3r/65849872430.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608918d7c6582---xulalipifobazumajedim.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/60212497996.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed346972fd---2358647053.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/tefidoxusenodidalomevulez.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/tudasonototonu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160712cd662494---71768393935.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/4410257687.pdfIn PDF document text
    • https://linker.tw/files/pupudaroxasonomifidite.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/warukizekipubed.pdfIn PDF document text
    • https://isleo.com/i_photos/file/jegajoxizuzibepuwu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/121053c4e32e5e8e0c1d85f3fd0f4103/putozepaxogivonulokipejaz.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/15942565211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=blomberg+washing+machine+9kg+manualPDF 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_off0000c999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 11220 bytes
SHA-256: 2632f7ea962c786ed0e860aa7a4cf047627565a9b9fe139211363c7945cb7187
font_02_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 18152 bytes
SHA-256: 97159e5a799e0d3081a7421db6be60cec65dc8092b9d89cfd772c8ed1209fc00