Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc51ab9f9ebb1e9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 14:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bec84fec9dc096c4f31acf63d6efa5c4 SHA-1: d136563f9d3464fe3e6461e3d75570343f604f72 SHA-256: dbc51ab9f9ebb1e97938338285a0fd7a459bf25e5a41403c770aded9b9b35bd7
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links are likely intended to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139210a0ff4a---sajilamaf.pdf In PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/60635327334.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/fixifenikiretemif.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/tekenajemudavidatapeto.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138387e9605e---11466399930.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/31077419783.pdfIn PDF document text
    • http://boldogelet.hu/media/busisil.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/31731224509.pdfIn PDF document text
    • https://emenu.hu/editor_up/tutuxoxejovisixexof.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/84846088720.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/wulefewiwogiwi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/c1pob9fhhp8hkdkasq9j38t82t/bigezawelodikabazulipadag.pdfIn PDF document text
    • http://lj-group.cn/upload/files/68801069260.pdfIn PDF document text
    • http://dobermanncz.eu/files/zijebezizedoponafiramol.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/47911841443.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/29832196038.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/dasaxalozexata.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/dopubojatota.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d466753fb78571e08f53b1ac6b115e47/97245030618.pdfIn PDF document text
    • http://moristas.com/userfiles/files/batigokaxitifojamomolus.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/sivuwaseledisodivapagatiz.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/kaxowogitubabuza.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/sigilajinugapabusozafi.pdfIn PDF document text
    • http://warehousetraining.ie/images/77692460089.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/82466487006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=facetune+2+androidPDF 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_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 18804 bytes
SHA-256: 68131978d28fe6fe0109f50e3cc89b5dfbc9072a251fddb04acd65209b03537d
font_02_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 10348 bytes
SHA-256: ff322697e1963fb4d68c189765c59efbea508c06f63f4080176e89ef52c02cd2

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