Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a487c5a2c5dde81…

MALICIOUS

PDF

93.1 KB Created: 2021-06-25 21:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5092ed75ae0b57b09377a0bc20c223b SHA-1: 2dbbf250b06223f257b743322c6696acd152bc53 SHA-256: 6a487c5a2c5dde81c4dd3bf8844fe4821d6bc6552717f1ac30996b24eadf71a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://chcial.ru/uplcv?utm_term=teaching+on+giving+in+the+bible
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/60e6cca7a1be0fb48a3c6f4867162f93/bifuwotof.pdf
    • http://medicapoland.pl/uploaded/file/bobugajepujazoripuvujo.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086feab28bd1---wubatosuzanaxuki.pdf
    • http://mobilesamara.com/img/files/file/73585748575.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608454427ff46---10456450571.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/47900728388.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cdca680699ba1852fcf500057e453b59/22980885328.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e23b2fead---dajotazilurikuwow.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19dde7106---74744680292.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0867caad645af083b92681f03ddc9bdc/37314311479.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/abd4c07da619baeaf74208b2a610011e/gelabizonuxugenoluvakefi.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875e276ebca---narewupajiv.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/v3g6gp7qe8i8io3cr1uddb43ta/94171517456.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe17a9323e---vufadus.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af0acede10---suzazemajajuvajebeb.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090705bbe04b---kujakifele.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607954aee3598---84845926503.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/cf7e3569d0b8248ab6f4e1e682530958/xokabexawewujigodam.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/72970d22734cc9bfb8408d4cce631c41/zobemetanuni.pdf
    • http://dioceseofniranam.org/userfiles/file/wasirorejerakidogosa.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fc11fc8a23e31e35651b6bdbbb5614bd/fowukelizorowarekasi.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ad5bf2580d42d1e80d3d5fc5c8ee2310/bixinaxekosaxibi.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a42193f0a3---50834541875.pdf
    • https://slezanie.eu/userfiles/file/bederos.pdf
    • http://btc-ltd.com/upload/file/52377389242.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12c.bin
6692c83e4912e647124d1a8619922f12f73292b0108ea131287ee9d18c3fdad9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 18204 bytes
font_01_sfnt_off000120f7.bin
b6aae611bdd2575730518e76c19f21005ebfe0ee0d13ce3f2eacd05582176c1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 10408 bytes
font_02_sfnt_off0001387e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1387E 16792 bytes
font_03_sfnt_off0001508f.bin
6d568972154aa9e6553788066da68fe6d5b0b58db67a92e881fdc4c3770f4e1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1508F 16252 bytes