Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6e903af7c29389…

MALICIOUS

PDF

86.5 KB Created: 2021-07-18 22:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f0eb85a04dac2b09e665a334d40875ae SHA-1: e06de8caca9ba59c7df926f70f02e94af7449124 SHA-256: 5b6e903af7c293898923dc597f86ab6facd61321fcb21ef2c6b12c554efaab8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to lure users to malicious sites. The embedded URLs, such as http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/87e28081879624683899e41f5cad10e8/lupibixojefupajomem.pdf, are likely used to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ed10d55ef---24700613214.pdf In PDF document text
    • https://strechybenesov.cz/content/minawo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/87e28081879624683899e41f5cad10e8/lupibixojefupajomem.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/jku0en8pr0mn2alcrknkqc1ti3/37423545753.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f6160968---27780497735.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d84abf0d614---12216325526.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964373620ed---95682568383.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/guhbrb4piimg3sraih6dqen2n5/wakowosefagelibefabip.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/fajogodib.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/26184220131.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/n62u0q3k1n1dba4tok7ro1dpo7/pixuvevakajum.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/27e7051879ea1d7f46a05e15123df1a6/lifewuzobexukeri.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/18763864599.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/97913302935.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-26/20210626145609437820.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1ec68ede---rawubiru.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/43302439597.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4463aaf5c---mepuvafiju.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/8hv0ggmodafui5u1b5udnukilo/36947920751.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/wivepapexokoxop.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef855aa4b1---50491376838.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924ad05f413---34322525060.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/usqs30hh4t1ifm0q8v9ikb426d/36862572111.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/jamorojajamobegofejof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=indoor+play+centre+near+mePDF 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_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 10480 bytes
SHA-256: 439dc170caac1798ec3eaa587286bfd08d39ed94168854a7d768d93d38d097a4
font_01_sfnt_off00010643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 17816 bytes
SHA-256: 55d917d6ebd3a1ef469667db70a33b4a74a90d70983f32c41ce35bad63447119
font_02_sfnt_off000134cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1