Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d92d2fb52949436…

MALICIOUS

PDF

81.0 KB Created: 2021-07-24 02:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 763bdba8629dc84888c1bbaa66e41537 SHA-1: 4334d1d391c97ea8568dbf793b272ecd60bacdb1 SHA-256: 7d92d2fb5294943629b9cfd689674fbe05ba8da8e4c7ec271c208c5e3b063275
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://adamlegal.com/userfiles/file/55319317081.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e0028af50---85198941551.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c74d6a7e8---saxisikiwad.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/11412226495.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b1681c37b---35553219034.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f2b82cdd819ff593b5c2cf09d678e89d/58170719085.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/56743135322.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/tevelimudimi.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/wejamutavewegi.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/jituzikogutenetud.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/e96333617ae89d0bc31e0713e4a0b6eb/20838542073.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d3fc205c4---kedumagukugomovogupu.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/73319171231.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/712b86ffe12373e290febe47f5f01ea9/2285034865.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffc7ab0574---7670180108.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/namin.pdfIn PDF document text
    • http://brlairport.com/images/file/puxewegasebetuvafanu.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/lonobutikomaramesezale.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/fevarusupegaxudixenilexor.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/80477470979.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cd89cc0015eabaa7231c93db653bb8f1/nuzofofufova.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/51467528240.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/bd5e315a1a338388a2ec27ee82cd9535/3202018405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=maqueta+de+celula+eucariota+comestiblePDF 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_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 18060 bytes
SHA-256: dabafe1300afc01ab050c6607b05c0ea016b8031e214cc0c8c8b0abd0cd57bf7
font_01_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 10804 bytes
SHA-256: 3b9659d10bf843ce25074fbb0d9403257d05cdb4bca272339ba33d35b972d855