Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef844e7b7ef3e74…

MALICIOUS

PDF

82.3 KB Created: 2021-07-30 14:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8336de47d85789c89addd23b5d676f7a SHA-1: 80fda81460516949bb9b97e163d6e73af256c176 SHA-256: fef844e7b7ef3e7430970b5a98fdf39b42521498f4d3f9b81e4198b16b5c2551
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of external URIs and link farms indicates a likely attempt to lead the user to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://agriturismoilnoceto.com/userfiles/files/lemitotumidijeb.pdf In PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160720aaf0cb8f---bisodedafuxu.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/94774837147.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/gamelikuravonamuk.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087490cf1544---gerexisufikigosurazir.pdfIn PDF document text
    • http://darienhighschool1961.com/clients/6/6a/6a5b14ca9cca6c9c7811e238b5dc87af/File/gabugabade.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bff1ddf73---59059872274.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xanugexoriwi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796396c9faa---tapunifopinotitowugajoje.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921b6f99e82---82740656485.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/43d2c1cdbc7efe5c155714d2ef7d4a1a/bibuwi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a632274a---20682136735.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/kutudipikajopepudexi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085964169cf9---bavuri.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6a672c972a742f3072d2890c362b45a4/51496616739.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cf7e4529a---pizixajoluteduzefejivusis.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/xovevediwutebotolukek.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/48875803494.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/91121259311.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/zaxovabugokutejugefi.pdfIn PDF document text
    • http://htygroup.com/upload/files/19217032760.pdfIn PDF document text
    • http://heizler.hu/files/file/rukapelupejunu.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/89014995062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=choice+theory+william+glasser+free+pdfPDF 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_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 11196 bytes
SHA-256: a5e963987b7f5a662a8bc45af306b749cb75ee646a07eba66c995e40da76d581
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 16972 bytes
SHA-256: cde47cd1b26f1d1510795a4f14621893622430123f1e4b39659cd3dff9a93306
font_02_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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