Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94c5ef645d8c71e…

MALICIOUS

PDF

75.7 KB Created: 2021-08-18 09:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0349a4b053bb8fe32c5807d47fdfdeb SHA-1: 6068dc67fcb8f70a90c7a140118185e047f6ba44 SHA-256: a94c5ef645d8c71ea46bc969efc6119ab6bc0ba44b6ff7fee3a5e105494cc7e9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/3615cb0258225ac13e082da2fbd84ce5/puteliwoja.pdf In PDF document text
    • https://krono-original.vn/Images_upload/files/xewuripatavojado.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fdrc6g036nmvq8aem3ibt8nro4/17864608358.pdfIn PDF document text
    • http://dzbnf.com/upload/file///37998131368.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/tisosomuvusofe.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/dojukawunulozisulimolela.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8009c4684---jurevot.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/fozonebetufufotiwa.pdfIn PDF document text
    • https://topupdana.com/contents//files/fozobuvex.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/sonezemubitujemu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54ad5d86f7---26813843353.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/pelijinupowuwusutubifeweg.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/5980555544.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/463429f2165d151e894600d2e560656c/80027043804.pdfIn PDF document text
    • https://msiutilities.net/documents/5330009568.pdfIn PDF document text
    • http://119pump.net/d/files/dematitetinojelikov.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/93666675757.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/rudolupujotikesinirazizol.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/faloxitomemavugogiloferes.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7v1nfevjb9e3ln5lrc4smv6s77/97503869061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kuta+software+infinite+pre+algebra+proportions+answer+key+with+workPDF 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_off0000c38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38F 11160 bytes
SHA-256: 50c3a4fa51b88337c741dc3337cc5fa1e2c7a7e07118a4e2755db9143e933e17
font_01_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 16668 bytes
SHA-256: 47fe9840ae27b51edfb0f13b4cfdff47e4a4e4102e162846359d0104a3c12de2
font_02_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1