Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e25cca5d35ccd23…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 02:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e334d2ee2a671c116ff5492f9971257 SHA-1: 022964ce75dfbf15722235732729a86d37c1c0f1 SHA-256: 1e25cca5d35ccd23d9bd7d8dd0e5eea447a7b31ee352ecce24a5b767ab2eb55e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. This suggests the document is likely a lure to redirect users to malicious content, possibly for phishing or to download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8400eb7f---xemusekabuwidowekox.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070474ab2438---naxufemufigimepomuzepa.pdfIn PDF document text
    • https://bselink.com/userfiles/file/57650805272.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8df020fd7e1f3523ad7911023c446298/tudubatufibojalimuxuvilaf.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/5935844667.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a995d5bf08b---popebozubonebidokigow.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28f6dd7f6d---tageboxogiwiteguvoxawetor.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/linabugatijobit.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071872e16631---66296855645.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/90099886384.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/5009105360.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pve9qm6qu7ll79deqj6dna8c8a/17211171184.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/61444880884.pdfIn PDF document text
    • http://hongdacable.com/d/files/xabapavijajewinumixezobek.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2761056e---xobup.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e4be2c2ea---52601763358.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/zunirazominatoxot.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d534abcfd4---tikabunijipezimanewuk.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/6pmkckqg0r58i32m30pg68gtc5/magos.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/vedeteburenadafizatosidod.pdfIn PDF document text
    • https://sanidom.pl/img/file/libara.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160edc5c92f5d1---bitiniwulixupeniminasakex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=nadine+lustre+drawingPDF 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_off0000b873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD085 16536 bytes
SHA-256: ffbdef877c502d00a049fc29e539e9e1e7955a5e183d87ed9f27b010e44a2ed0
font_02_sfnt_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 10464 bytes
SHA-256: 7f05964e0fdb3d86bc39f30378cab6584800ce72f0e5cb29468ce3ac99e85888

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