Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bc14d45c7adc51…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 22:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30220e5a9f751473ede5c8b8f7b8f457 SHA-1: 23ac1bb206feb357e4bf78130815501ca20d717b SHA-256: a1bc14d45c7adc51f76d7e6d7cbf2c632243cdcc947f2189cab5834840eefe07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm characteristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=audacity+for+android+phone PDF link annotation
    • https://tatsolarlight.com/uploads/files/bexebogikimanimivaxaxi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3klg2dpl60cqgl08a42rrf88en/13605019612.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/17313157840.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/98008124479.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/bumuwajoxebumirixejupa.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sisiviwuw.pdfIn PDF document text
    • https://longhoang.vn/upload/files/gizaligugitopagutum.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/56436346400.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/82652483025.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/jexanuf.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b446bdc1b51fa226ccfb64b0eb4333fc/xaxajupitaxug.pdfIn PDF document text
    • http://vswet.ru/f/kaseditukebamigesem.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/wugugidexonobomiwi.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/kasabivikituxegom.pdfIn PDF document text
    • http://df-2.de/images/daten/file/54687040768.pdfIn PDF document text
    • http://santeh.md/img/files/vewigusupanuzav.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/kemuxotipikirurifate.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/50944012449.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/18b066166e8c3996aa470b22c04348a9/13510680268.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/pupexasubigewiraz.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/mojugedu.pdfIn PDF document text
    • http://only-svet.ru/upload/files/77960699819.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/loroxagege.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/18014259758.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/48464531913.pdfIn PDF document text
    • 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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 18856 bytes
SHA-256: 393197621414e3c5f16a25336023e9b14adf9bff736475c885540ea0eebf4384
font_01_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 10696 bytes
SHA-256: f549183199c8c666bcf336ae8bc529b1d4a11f48d8e2d80b77aa00a06b7eaf14
font_02_sfnt_off0001306c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.