Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e6a759d80611c9…

MALICIOUS

PDF

128.5 KB Created: 2021-06-26 07:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bcb2b33f490292b8bdefe2b0ed3514aa SHA-1: 7285bf252960780017e898c287c6a800a5e54fb2 SHA-256: 98e6a759d80611c93085e6185b0e38786edb81ea2bf3b97e40aedf1bdc87a694
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates these redirects or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://garglob.ru/uplcv?utm_term=sec+27+of+evidence+act PDF link annotation
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/dkijvhhfp0vhq552n5tk0s390e/40090614581.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d2f620dfe8ce41aa3dd176f27fdb67a3/15752564976.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/30cb7711760bb331e8bb24876fae4eca/fudupejuzafukovudunijaw.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/fbd3f5c4495e0e2b01890451c7db61aa/votomopikofujijerajimopov.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/24485898412.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b9032331155f18b4e57f12a637431528/6734679129.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b3f35cb293e553ea12700c200921fc08/zoriboxizukupifivubajekuj.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca48aab2d63---polilexaleropuronekud.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b85f9d2989---74073477566.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/91c3fb4b93b1f82081272a07129eaa36/newejatekifukifopaj.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/372665ddc81210102b870c75ecabcd5a/gesezidanewurap.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3eaab097f---jawanasesurepunetuwep.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9623b9daa3---livaxu.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/64280473820.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/13180280880.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/takewabejikapak.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/77540340623.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/a8ccfac884ecc79291565118df7ae216/wogam.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/55a37fa53f3851eefc1af254e16033bf/jinub.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/lumlng5k0gpmub8do3akhshpj0/53604655560.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210508095657.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/7860823148.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/48265744398.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/puxijutaluwi.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_off000196e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196E7 17368 bytes
SHA-256: 6d567e445167f8d0c2bdae9478fef30c7bc4fb9a7cf918fe98140dc78cf9cc7f
font_01_sfnt_off0001c41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC34 10464 bytes
SHA-256: a98bd7c36b0799343e235dc41624fde6c15244e383c5241807aca8f1d825499f

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