Malicious PDF — malware analysis report

Static analysis result for SHA-256 5529578a268b01f0…

MALICIOUS

PDF

96.7 KB Created: 2021-07-18 01:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8792f66181235f7922c9b52ea9e8d8e1 SHA-1: 9afbaebfacae50ac6abc36b3821720b1bac1b13f SHA-256: 5529578a268b01f0ce736a2688d9bafede38e42b2c8bc2e11c77996c77e24a95
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the nature of the links and the ClamAV detection suggest it is designed to lead users to malicious content, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/vdt3cr2jqsm4c2kp5h1rec0b7c/73583059657.pdf
    • https://mfdesign.hu/files/file/73907702384.pdf
    • https://etimes.mn/uploads/files/6311412944.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbac114d4bb---28489269702.pdf
    • https://hospvetcentral.pt/site/upload/file/94270380892.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/qrt9nkmsn8gfl72fvq83blspg4/fumemidasutofo.pdf
    • http://www.mustwalge.ee/data/content/files/35362331552.pdf
    • https://baxsporthorses.nl/userfiles/file/muvonilofatonotezizuwa.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/bffdbe9f97da3dd95fe06511af4516b3/vobelufob.pdf
    • http://pressvaluation.net/userfiles/file/fanonukubepudisorin.pdf
    • https://kawanmto.net/contents//files/doned.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52019721d---zitaredosodabigitubo.pdf
    • http://elitaliaweb.it/upload/file/88713882884.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb0026024---ruxogazozapisekuta.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f112dae3a0---dijesigevapanisekexokaj.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/66b0087d6b42d0ff54508650777e46d4/lajozu.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7bc385b52bc5d896ec2e2cf8f3b7f09c/11401708151.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/1a1c246929eaf4deae4123d087b73444/16765834414.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/52106056551.pdf
    • http://ecogestval.com/userfiles/file/41869495522.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+currents+of+space+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_off000119f4.bin
a66d964fd57e3b207713afa4732e2dc1e9b3cfe1941f649030c78be75c0c65f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 16640 bytes
font_01_sfnt_off0001456d.bin
be31a942f878becf38ec702f89b7b360762d017a29c9a939de2e9a71221dd367
pdf-font-stream PDF embedded font (sfnt) at offset 0x1456D 10644 bytes
font_02_sfnt_off00015dc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC3 16792 bytes