Malicious PDF — malware analysis report

Static analysis result for SHA-256 798f4559f811d62c…

MALICIOUS

PDF

89.2 KB Created: 2021-07-18 17:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 485bcbd2033557bb8a9de09ae44d7d28 SHA-1: 7bec2b283a5ac6b89e363c0a3f3e729998cc3512 SHA-256: 798f4559f811d62cdf623047591c7a686ab68a55fe9879b0012cd00613d6ab69
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. The PDF structure itself does not contain executable content, but the embedded links are the primary vector for malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://residenciasanamaro.es/userfiles/files/ruduxasofogeninijorulago.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0bf2981a---49201019862.pdfIn PDF document text
    • http://slsnn.ru/content/file/lawebopimufepa.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/856efab702a2a733d066fb46fdb19e10/4983834477.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/nukapalet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba751d4eb4f---xuzozakawofu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1e04e0f7d---44740230876.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3p5oc92csp1mr6vm4al3a980n3/rofavonugasavavakisejo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a4a112bc7---mulaveji.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d57593af---50330148393.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/48acefb98b86eecb1d0a119c8b61f9d5/10786408538.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/98468288040.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160966e577e37a---ratukusizuxexuk.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/48195189841.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/33948984830.pdfIn PDF document text
    • http://jucal.es/images/file/lutijinepajepawoxebasas.pdfIn PDF document text
    • http://www.toptehnik.si/images/tozupofupapedebelunevopit.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pafuwoxalejozex.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/89455451906.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad983386540---sikofin.pdfIn PDF document text
    • https://educhina.mn/editor/files/6704793212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=deck+cadet+record+book+answersPDF 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_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001115e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115E 17496 bytes
SHA-256: d287d859a540ec0eed256f65c5fbfd87b2342ba8d3c801db06951f7ed9b40dec
font_02_sfnt_off00013f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5C 10544 bytes
SHA-256: b240956d2d784a4bd39181a5ff5bd88ef275dba5f2a2a2645a1c3ebfb38c9b83

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