Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedab496785270c0…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 11:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6efef6dd1f9726137a963ba13d140663 SHA-1: bb90ecf247488edafdb0df4e14a3a46a7939f17e SHA-256: fedab496785270c0739fbcdde16766ba1cb0e0fa2678df0fce6c24609cac6c3e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to drive traffic for malicious purposes, likely phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=cooking+family+mod+apk PDF link annotation
    • https://mama-light.net/business_school/uploads/file/defodesuxunifikuve.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/wezodatulugal.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/sabigezonekoluwagixovokax.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144c8dcc7bf8---25646952167.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/likalikekafasuj.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/sasoferuwebajeduragasog.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/volakaj.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/27794375903.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/69177330854.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/67740176678.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/32870918311.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/44977613699.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137559498a37---bitumefuped.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/ruzuvekebiminu.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/25948522494.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1bea0565---gugirab.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae406ddcdc---lijexitodimivolawokomiso.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/kawitojasajujuleru.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/lijowulopibaku.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/nadixibodapipuzabobeda.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/fekuxit.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/regaxafumadefokejeza.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/manepovojagofulodeziwit.pdfIn 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_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 17252 bytes
SHA-256: b202a5f008b42d2e565988d048099a4551b5ef049ec15fb44ecc3a2c1ff64a6c
font_01_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDE 10580 bytes
SHA-256: d7c3f0e6a02548d2e91a8b6899202d46f4c5902be9a43a1fcf8ad2c6de282ffb

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