Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb07ae92bd56d74…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 12:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10e38190a8e4b9dac3741dd1b531b6c0 SHA-1: dd9a6a767dfd46c383c37fa6555039c5d7184829 SHA-256: cdb07ae92bd56d74ca6152b4350d58d66a832cfd79527b4d7255418d5020c716
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of these links and the overall detection profile strongly suggest a malicious intent to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a3777eb65---29865866999.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/ximire.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee970f8d4---25286118440.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/keeqqoqkvtsu77reob6ki161k5/5748540117.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/17121819320.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/m9g5ojoq5a1bbnln27g7lt79s3/wanefajovebi.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/gawazemekapimejamuw.pdf
    • https://bushregenerators.info/userfiles/files/fakazati.pdf
    • http://live-lessons.net/lcj/web/uploads/assets/file/lidikopesu.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8096da713---19901175345.pdf
    • http://nbpcpentecostalchurch.com/clients/65183/File/jebexax.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0ac3a3708ed542539d8fe3b5b7c8de44/3010287296.pdf
    • https://kompaspt2.com/contents//files/71004974385.pdf
    • http://aelma.com/sites/default/userfiles/file/jijajujigewavedurutenu.pdf
    • http://www.sudaff.com/pics/file/97844629355.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ad124934fa27251cd00d17789e4aae6a/22753078528.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/7f2ffb43844b2f543aeb054230ec6906/komalajer.pdf
    • http://traiteur-ribot.fr/userfiles/file/vidutegixe.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/efa898b39706f3600f8e853117cc8166/tajikoxiw.pdf
    • https://balaji-technology.com/userfiles/file/17885287332.pdf
    • http://mrmax.ca/clients/9797/File/5129937387.pdf
    • https://artgallery.devctn.com/ckfinder/userfiles/files/59366476975.pdf
    • http://nadiadsa.org/userfiles/file/22067926112.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=non+tariff+trade+barriers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef79.bin
4a236943b1dc206a5fd90313fa8da433cc32dcb02abf91b5c014a1f73d321648
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 10560 bytes
font_01_sfnt_off0001076f.bin
9755130b467f15caad20939b7c9d2adb698fd17cc1152e43c30b9ccd7403accd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1076F 17192 bytes
font_02_sfnt_off000133e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E4 16792 bytes