Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff8098dbbe2e984…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 06:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80b61fc2d6f51ea8bbc3c5dc03089046 SHA-1: f80b96dadb20df2ad93a506e39e834e51062363d SHA-256: 6ff8098dbbe2e984b2856c2238cf0c9e8710aa7d1f9d54d6cea035a83ff35aba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ga1193f16nc5q8kk8b6paitc2c/50820225849.pdf In PDF document text
    • http://poltinik.ru/userfiles/file/2696575026.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9amoc5qopcrj5smcv84k3fdael/lelefujivajedupoxot.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106060249408749.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/zakovufe.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/3013618020.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3f64bb218---98528088900.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/r66hb5bnahehhtjjsdt7bp0bif/70814483012.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8fd5de31---12333847499.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/8019868939.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/8148546445.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/70356723261.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c93abeb68a67595745109f5d95acc12f/25015141078.pdfIn PDF document text
    • http://hejia-ele.net/upload/8496232484.pdfIn PDF document text
    • http://abnicum.com/files/file/wuwujaruzipodesozetov.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608d81c487c59---sewimeneruzazakonanu.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/75537323546.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/55903265947.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/96644679310.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/zafusutorikufu.pdfIn PDF document text
    • http://lulanjina.net/upload/files/59396805620.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202108171211538635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cinema+paradiso+piano+sheet+music+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_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 10972 bytes
SHA-256: a86616fbf5955054c848c6e93d3df48f6903717e33e40e91d78b54fb4c6b7608
font_01_sfnt_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 18400 bytes
SHA-256: c6eb9c7749f158a14ae65dfe79891ea4ce02465033fa349a44b36c39058cd521
font_02_sfnt_off0001307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1