Malicious PDF — malware analysis report

Static analysis result for SHA-256 facf2e8b927a5cce…

MALICIOUS

PDF

73.1 KB Created: 2021-06-19 09:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afa0376915477fe4c5dd3fbae7361166 SHA-1: b693788778f158cfdc138fffd53c1f16732ce0c9 SHA-256: facf2e8b927a5cce69e460500a4ed21ce43eab66130befc8603497a2e1d23de4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload locations hosting other PDFs. The embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution chain, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d7e0c95ab872a2bf946683a08132b368/4351847137.pdf
    • http://hasyo.net/files/file/xekimejuvexat.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2c750807---widururapup.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098002acfb18---malagozunev.pdf
    • http://computer-rudolstadt.de/upload/file/98628235747.pdf
    • http://sowitech.vn/upload/files/rumigapefebes.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b9d33ccd6---venelowajoku.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608245777ed8b---vegumiguvorixutiwowob.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079a24c28a4b---65976718674.pdf
    • http://opuspoint.com/ckfinder/userfiles/files/xutobenemaruzefu.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608a974c8fc7d---zugazuxazuzarajidaxunod.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098083b8255b---64955038696.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607942d847769---sitimesalibiwuxasudires.pdf
    • http://diysmart.net/userfiles/file/zijobo.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/82f795a8036cf5635dabe1d6dff8c7a3/85941087691.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083700def7c5---jiduxukuvatikuxubapal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=traffic+sign+detection+using+cnn
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01e.bin
b85e4ba1e2191e3c2abd0f729183b6db55064712270166cffa7fa869ab4766ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 5104 bytes
font_01_sfnt_off0000f186.bin
0d26c0006b4c7e587b2576a85e4f0ef200e76e0693bbc414e0be5e76a45e43d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 11100 bytes

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