Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbab0101594a3617…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 21:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54ce9e817cb6f15c571e8162e57693bc SHA-1: e2efc7ee3e8a78372b617b3bfd48f4f3887caecf SHA-256: fbab0101594a36173e0bc6e096e034054e97e715c3ed2b308a86dab7f5c12400
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'SE_DOWNLOAD_BUTTON' indicate an attempt to trick the user into clicking a link, likely to download a second-stage payload or visit a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=best+pdf+markup+app+mac PDF link annotation
    • http://scro.ru/pic/file/5111251234.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/bq30ne7b5dr28lavjjdhgt0lj0/petujeserupisizarugumiso.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/34641200619.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/fd595cb1f52d48fb8450b464906fbdb1/nikejalisulemoteleri.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/zofozaxovikofirupuki.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/84236850976.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbab9b71cc---gekefajatevutomojarizedo.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/95261303184.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08a978670---12475922561.pdfIn PDF document text
    • http://nakatka.com/files/file/6207150492.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/37622188.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b770d11812f---76633626266.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f2d32b73a24a47cb913422c98d0b8ba7/11905701145.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/v6etosppo349cgivm1odmp1if6/jukowob.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/58536291493.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/21529696231.pdfIn PDF document text
    • https://securitydm.net/slicice/file/35066648868.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/fowarezofonijanadeve.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d050f1b5c1---46925839192.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/sowuxogozizewoj.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/3a84b56b193e3a7cf622e63d58fb5826/vovinogatiji.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/858404c47bb0c6d2c0d3b2bb50b09ecd/nafexonawosudoxox.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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 10664 bytes
SHA-256: ffdcae6d330a485e0a9602233c0625cd14613eceb404ae159d17366bce0b153a
font_02_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 17640 bytes
SHA-256: 6edf565a816f82a5b0faffece1456b81e2fec040e04ff6a3f75a025e657aece5

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