Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7cbb41a1e17d45…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 07:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b96a01bce0728eb89c086c7c9e0afd63 SHA-1: 87f5f5cd287e61210c3ebb1e504552a004edf92c SHA-256: 6b7cbb41a1e17d458b0692903455a5d8eddc341866ba771352d51d08c5b5c59f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/dusadilanutumuw.pdf In PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/vk1v5fb126rndlrogr75on5ojf/73963924061.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/paladeg.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02f35bd20---birekavosadifuredo.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/noroxozisipujurasu.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0813/97259efba2ed1e41c934c60a2155b447.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/55873170040.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/57573724539.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-12/20210812230036977986.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/87315248947.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/89eae23de7c74144a8e57314f77c1589/gubutu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a40e02ede8748305a58503b17df9d7cb/93356786832.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/situfajosugekuvuna.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/3335113476.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v78fp97n0s9o52t5c6gh4islfb/pilojedeka.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/24256735376.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/cadbb144ac966fcf8a26c1dc703d8cbf/bokowelewifonisawok.pdfIn PDF document text
    • https://htchninc.com/d/files/govepetoxu.pdfIn PDF document text
    • https://peterdegendt.be/file/20846888147.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/pubevuzipigiduledepi.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/36591020385.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wimedopadasakelaxukaluxof.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610991e089011---1996559736.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/457a844fa5c3378f599953890ecef31b/69087368971.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/e2a079ed37affde2af6a499118ff348e/63671449738.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf208414f8c---29448104333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=college+attendance+management+system+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_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 16480 bytes
SHA-256: 76820a86fc5d9788af179cf063ad8d8833764ccadb2dd11b9463d044a70d6db9
font_01_sfnt_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 10916 bytes
SHA-256: f4d51ddf484d543a07f426c6086068340edd1d2c0dfdfbbb0146ef54c50f4c0a
font_02_sfnt_off00011c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1