Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf012982bef9007…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 04:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 54ff7c04341f1ff9e50dd4cf3bbcd515 SHA-1: d79e40d046776b6ec46925cc56862ce0a827cef1 SHA-256: 8bf012982bef9007a42334fa93faf42b6d997dd2b7bf1e6d998fb832cb5a754b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=headway+elementary+book+pdf PDF link annotation
    • http://chanakyaaerospacedefence.com/userfiles/file/41511972280.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/1090447995.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/59951609632.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/29361777460.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/47267266472.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/bepogojawedagekazenava.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/75011223723.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf5cf425d3---netidazezewuxeli.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/54125945159.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/64445120434.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c719677292a---gepujozesatomaziwazuju.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/8ca67b1f343914c4fdd2e12ea5797efc/62026617980.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/fubajoxigubumigufipedewe.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/26216038430.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/88089289033.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/likeda.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2frmuafjgmmuam60i83vop7o45/baxitodasegeviw.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/23283926426.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/lutosunirudav.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/7juilhj702hrmr1hm9okaq8ko3/vitagafezalobixede.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16116d9dc492bd---46854593309.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210829072942.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/molizokanariropoxitasonoz.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/sh5ep0fr0rimst63338230qg01/mupubumiz.pdfIn PDF document text
    • https://cartolmania.it/file/64200943041.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_off0000d5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 10824 bytes
SHA-256: 7f635a7d982da82805478b1da7e852903c73d36a10473032297eb63eb5600478
font_02_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 18688 bytes
SHA-256: fdc7315e3269998e2a781594eb33de5e6f1a731fb171baad2257fae47b2cba5e