Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff01cfa5d86a87a…

MALICIOUS

PDF

86.6 KB Created: 2021-07-19 14:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a63b6a8ef0a2a441a2db82c664e93d74 SHA-1: 2ae05d1709a644ee94ad602d9806137e6a12c342 SHA-256: 8ff01cfa5d86a87a74a6f462c31fe4587944260f5d4f3d031318aa5c774da13b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised CMS upload directories. These findings suggest the document is intended to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c14a16c2899093724f46c742f5930926/befoborexitewakozenezazaw.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16093bab8e0d94---20194768767.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c1c6076c9330a7e2f065413bd2404aa1/binanagiwapobuxejop.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/71636068082.pdf
    • https://windfreeklima.com/upload/ckfinder/files/kanutejafidivurijamotes.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/cf73876fe84657f643cf514e490e57d6/pemisu.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e904d490466---63469129763.pdf
    • https://batikatravels.com/userfiles/file/30132270431.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fab2b2589---luxikogikopoxedebe.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/5e495d1455d85be945ae09a0f5d33d3d/fodepevesunufokuw.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c271a29183b---nuxigan.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf94bd2b5---vakajetabasup.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b523f5a95092553e828a19a0b2b72da6/58603943463.pdf
    • https://nhahangbienhaitien.com/uploads/files/24105391482.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7ca0b02b54d2fe8eab65724203ab933b/94372613086.pdf
    • http://bannails.com/fckeditor_userfiles/file/30915503651.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b860400e4---nidojasaxexexugi.pdf
    • http://kronikarp.pl/ckfinder/userfiles/files/bivosusogixako.pdf
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/99294005873.pdf
    • http://budohurtsa.pl/userfiles/file/riboliveka.pdf
    • https://nanosoft.mn/images/content/File/romitisazipewunuje.pdf
    • http://asbu.net/uploads/FCK_files/file/43390318396.pdf
    • http://al-bandak.com/userfiles/file/85568328144.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tenth+science+book+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_off0000ec88.bin
e72061e8859ca0f6e99d67ce74ddbc803ad97b8d351499de07c0e1b58e83854d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 10604 bytes
font_01_sfnt_off00010478.bin
b275717a7e576308d62184d6d1216e9d74c0cb4cea9f01f18eaf1f8188df1f0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 17864 bytes
font_02_sfnt_off000133a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A1 16792 bytes