Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a775f4b402f0bd…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 18:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f95bb7d5205edb413f331ba636c3743e SHA-1: 276b368806d028be30507f11aa960a7988b26f67 SHA-256: c7a775f4b402f0bdaf70a114faf1fd9ed4dcea28ffcd248848a76c7c297e130a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being a link farm, with several URLs hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://robalton.es/Albums/images/file///bavinupudenat.pdf In PDF document text
    • http://hayatteknoloji.com/webimage/file/gafamalotuniteg.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd971b377e3---gujivaroruganujibonipo.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/dufimivesanis.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/25ed410c288dd1664aaa595e3f6fed9b/jejukumotuza.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/16701972362.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa0a03714---setutunuwanigatawif.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/61477599558.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3f04f45e---38123139580.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/nixoxim.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/seromofutixokesama.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/63155439574.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/99611259789.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/6833346749.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/27622485458.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3f45b7912bb76c4d50f70eae832a8a3a/83533383688.pdfIn PDF document text
    • https://medtek.vn/storage/file/vebodilemadosuzalu.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/xatupifedijeguwelozam.pdfIn PDF document text
    • http://efrex.cz/files/file/25455711005.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/lakelujaniburaxaf.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/cpnbng24lgnl2o4ncfprdr5equ/dajinika.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/ralogo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160860a655ef73---17035214201.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e2e2d36b---jiruki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cs+lewis+the+screwtape+letters+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_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 17636 bytes
SHA-256: 13e2ae66eeae93905ba0c01bb6b2f48f6a285a11a8874ba28c67cddf51c2c3af
font_01_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 10612 bytes
SHA-256: 4cee5d7bca90076f13d17a3c490354445859cc041ef658745c3d06f25aa972b0

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