Malicious PDF — malware analysis report

Static analysis result for SHA-256 3071a0f8d32b0aa8…

MALICIOUS

PDF

92.8 KB Created: 2021-08-15 10:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16e71f94f7bd44800fcb54c3cf3dbe9a SHA-1: 25ab6cfacecd3d3dc735b40b3fc86af0507684fb SHA-256: 3071a0f8d32b0aa874f4d3085fafb7e26c6518ba941f05b6fb20a02191e203f6
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, likely to trick them into downloading further malware. The presence of a 'download button' lure reinforces this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dialogueinpraxis.net/files/docs/jerovuxaxawavewonazalog.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607122ca523b8---93849583462.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075175adc96e---keluxamis.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160746c8457623---fitufofuxudapusul.pdf
    • https://agrilaui.com/userfiles/file/kujibar.pdf
    • http://didaconcept.com/admin/fckeditor/file/bexisematitiwagimomuvisef.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4423affd2---gavifazijuloxaz.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816e85dcf6---perutima.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/13935559385.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6ee046c7277a29b01764bd5957521872/77704855356.pdf
    • http://barcelonahotel.vn/UpLoadFile/file/vubejuw.pdf
    • http://www.allatpatikapecs.hu/images/file/1077191565.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ddf0811d8---jadonekujelikuzagegi.pdf
    • http://fairway.cc/images/blog//file/wuxoxatopew.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/gafumosula.pdf
    • http://pivotal-technologies.com/userfiles/file/lifeve.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d43368e60---maguwemug.pdf
    • https://dodomacnosti.net/data/file/2473214452.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfd8413e7a---xodotosigumalibaseg.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/31288292209.pdf
    • https://camping-du-lac-dijon.com/fichiers/39941844447.pdf
    • http://greatnice.club/updatefiles/file/42395070640.pdf
    • https://emilline.dk/ckfinder/userfiles/files/zedifevuk.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f6458e6c2---49172502525.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d278f1fea---dovekunoxup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+reply+phone+interview+invitation+email
    • 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_off00010816.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 16792 bytes
font_01_sfnt_off00012028.bin
80d8a96323a78b976d58c97fe4d7778b6d054680f653f8ca641149b2c7e3f990
pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 16908 bytes
font_02_sfnt_off00014bd5.bin
fab8ed62beec17e980f240cb9df9639fb2a006e711d1ae6128e16f7346ee631f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD5 10604 bytes