Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68edc0499709e08…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 11:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a59d5aa89dae70ae3060dad73177153 SHA-1: 04ad5399aa473b80d750a3ce54a03111b3aff470 SHA-256: c68edc0499709e08e0967c9a2a21e0405d5b8cce01f09849a760f167cba66815
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised websites and domains, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. The ClamAV detection and ML classifier further support the malicious classification, pointing towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=dave+chapelle+standup PDF link annotation
    • http://changju-hotel.com/CKEdit/upload/files/zaletovomagawakinopiwa.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/delirubigixibajug.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf1e521f26---mupomopujag.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/4458292179.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/74244682587.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/33348933563.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/26404631450.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/24697920115.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/46a8b1c196308aa00acb80232953d20b/joranagumu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14dcab3574---79949607928.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f2993d6f---reruzejulevo.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/82787939554.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/59049201144.pdfIn PDF document text
    • http://schokozentrale.de/idata/29223703686.pdfIn PDF document text
    • http://hongdacable.com/d/files/25812601408.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210804_48CE6DCCF699EDF3.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/pimowiruvu.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/78218715149.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/mozidexemesosokaj.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/kasubegogabatuzo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/gv58ii6fofv83m72dqnogllj6t/jexojorof.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/sederi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90c17464f---sutukugeb.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d4bb4dc0302f0e72419ea61615f7d6cc/wewivakilupitexega.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_off0000cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 10464 bytes
SHA-256: 8302162f82d2bebb552ae0ee55085cbe2d530611f14b8d9e4d1c33bde0050608
font_02_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 18116 bytes
SHA-256: 3863eb6dcb9aa86695ba8f6f86c775dec03357e44cefa38f9be078bc50b03eb3

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