Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6eb53442d97f80…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 00:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d681ca9611d8770d9fd1e6f7e0413858 SHA-1: 896a1b1c94dbe2beb1028f56f73273289839de13 SHA-256: fe6eb53442d97f80dd3dde6d0bcbf3c453d6eb678036f5ec74110d1fd691947d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://harmonie-avion.fr/actualite/files/xeregufemalurufa.pdf In PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ab727e25b8c170c6687c5b352fdf99c6/wuzagipexufozexugexowavo.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/tarinoxuvoxadaki.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/fefuretanomumifotel.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/duvakigusejarogozobulox.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/rajulido.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/potetepugabaruwunog.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/77305933934.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/mepoliwami.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc70566c6---dubijorobuwatonof.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/devalojanow.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/39508167628.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/78310341855.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/ruzofixezosazilosa.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d83204644b4---20365735893.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/15469500911.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/67255141282.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ft2b9vk7rt614tk2hhpqt4a9m7/27743346412.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e154c17af4191aaefdb740aa431f144b/41947805104.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/zepijadawolegunozami.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/xepamari.pdfIn PDF document text
    • https://nexusmediation.nl/files/28401050404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tracy+hyde+melodyPDF link annotation
    • http://dbpedia.orgIn PDF document text
    • 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_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 19408 bytes
SHA-256: 31a17f70a2dbe31b0c052e0a8ed7faa4ff889f5ec547d923acc4c3dd2e9bf6b8
font_01_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 10248 bytes
SHA-256: cf99ff24979a1370e96884d35d3b9804eddb3a85ce7b7fb670751dcff1c3054a

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