Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefb4988e186dfc7…

MALICIOUS

PDF

73.4 KB Created: 2021-06-28 11:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 241e288dbba6dd6f345af188213422cc SHA-1: e90302d4cf8ac11608370e9e41c42c1760b84ab2 SHA-256: cefb4988e186dfc7ad32e61f922ee084b0fbed4d8fe618ae29aca4112ae00a8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=game+of+life+cards+pdf
    • http://dahchen.tw/userfiles/file/tiwozudaz.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9746a6372cd729117ff54c926970fb5b/30276888841.pdf
    • http://antifftech.com/uploadfile/file///2021051517153956.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085747189b6b---80341268595.pdf
    • http://uleshuzatshop.hu/files/file/wofilopudurikez.pdf
    • http://dzwigipoznan.pl/userfiles/file/51735534808.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d924c975385---zimufexedetipugu.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/282a4d5ff49be55e1468d91c7fa1a2f4/10649830716.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0718bd0296073e96812f8f3d0977dc9a/37485671336.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c30b7c7c7a4---dafebenunixebozekaxuzi.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/remmu4etf7lvvie4p07f48jpn3/jalunozupeli.pdf
    • https://caribemed.com/userfiles/file/kotavivegilejetabu.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160799b6958ea6---22239512451.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/vfvvg2heu08topci5qagrctfq7/20707958572.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde96dd1d4---2652691442.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc22654427---xawemunabutupijimunufi.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d0b00ebb4---tumoxifiwo.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf47c7eb015---zubug.pdf
    • http://rhondachem.com/d/files/lurageledisoxurazapitije.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/baec9ea5edde8abb0c3d3af48e427ae3/26692096959.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc492755dec---fukovilojik.pdf
    • http://trungnguyenjsc.vn/uploads/image/files/wikexojoda.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5hctnc9kag8374h8huk3ogtal5/vozutexireve.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf72.bin
be3bd4ce7164c8e521151940613755d8236f9ae230d9d7088ff5de5a4795b42f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF72 10616 bytes
font_01_sfnt_off0000d7b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 16792 bytes
font_02_sfnt_off0000efc4.bin
951ff96f53b4dd16153f02870f10d986d242553ef723bc5e5c4fc439bb942cd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 15816 bytes