Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fd929d6db4670c…

MALICIOUS

PDF

82.5 KB Created: 2021-08-18 15:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b38b10c0ff77dcb871b96a0e7de0ab65 SHA-1: c9f07cad2c220e9df8c1afdda50a9a0e0be7283d SHA-256: 27fd929d6db4670c2b6b2cf94926a26fc2a109626b12bef1e418b0552d25a8fe
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to lure users to malicious content. The presence of multiple unknown URLs further supports a malicious intent, likely related to delivering a secondary payload or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b226f6aed4---tusodigimezikis.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/dc500dc03f4567e11770f934f8d6cbb3/17636797293.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/21833405941.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/64547145543.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb7020c061---91922945189.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/bokolijonex.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/97439612316.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/90779905462.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aa1e4c307---15121425148.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/xesotijosux.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0e7b4d75804036d3414b16a7940fb8c0/20980936395.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/96546622147.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/28399132982.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/86166560262.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/14606707705.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c11726b56---87515406492.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/bonadalajowifafi.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/benazegepemomivoweka.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845b25490b2---97115255914.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2c85be5f03535416ac0c9eea255230c4/zizilokunuzowiwad.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/movoluge.pdfIn PDF document text
    • https://cinurl.com/1iri8rhttps://cinurl.com/1iri8r-2munnaIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=munna+bhai+mbbs+movie+720pPDF 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_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 17940 bytes
SHA-256: b13240b91bd493296a54ff8b11ab100fb9a1379240fb942f9d19ef6dd4900599
font_01_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12462 10864 bytes
SHA-256: e9272201ef824046c999c037c9880fbd24dede1400fbb30b4935f6fc75055167

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