Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0eb64ef5fd28414…

MALICIOUS

PDF

91.1 KB Created: 2021-08-06 16:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82c8df6777364c791a52ecfe52376995 SHA-1: 6320601b220c26c8af3b3c07f097f53937cc0ddc SHA-256: d0eb64ef5fd284142f9db6da4b682ee80793f1afed1716e95618e93a7e3cd5c8
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. Heuristics indicate the document is a link farm hosted on compromised WordPress infrastructure, with numerous links pointing to unknown PDF files. The presence of multiple unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608170bba2732---wegagifaniveteporijen.pdf In PDF document text
    • https://unicon-msk.ru/data/files/nadedogodosidikegub.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/237253375.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/416672630.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/85139752441.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b5fb00ee2dfcac8e101a83d8b472e0f6/gupuxogajifaxiwosog.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/bopozafan.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gijenutonunawuwavexaz.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/wozapenijoxalok.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/c0rb6vti8n3gu1h0n8tm8fj3fp/98882703621.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/mobenarozixenegetumu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/80251250483.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae49081bdad---didatikitawupe.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/pizeraxi.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/xigakubalumanetejej.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/bcb0b23e539a5922e1e926c2fe31ed12/vosuxerurupojozijub.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a03ec094e1bd09a82d9007cb0594cc54/xodubunasekegisila.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d1cf99789236ee32b05b87be37268571/11593242863.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace398f2542---12107298854.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe38e89d11---fumosanozumuraxoxusuw.pdfIn PDF document text
    • http://faradbox.pl/files/file/pisikafunabe.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f0e69496cb8428666fe773039c0e9021/segalumunaxax.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e5a80816---bebozogut.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210712_235652.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c9e2a50160e94a76b2617c5401d523fb/jatozafifikeletu.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/dufijibonutuwiluv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=do+spark+plugs+still+need+to+be+gappedPDF 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_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 10900 bytes
SHA-256: eab62f1b0fa4675ef9a69fe3a68b7125e5a110a57b4921d7fb75c29c32675646
font_02_sfnt_off0001307f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307F 17260 bytes
SHA-256: 5eba30e1fb45239860ec28788067c0e0c7ba46c23e0cd3217603cc892e3be93d