Malicious PDF — malware analysis report

Static analysis result for SHA-256 62486c7728d0b1d1…

MALICIOUS

PDF

123.9 KB Created: 2021-07-04 20:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 985bbb7bd13a2a22726068559898a9cd SHA-1: 79d1324a15ae0c77b7e2109c1bf6fa49a21ae1c0 SHA-256: 62486c7728d0b1d171609480802c4665c418d3fae40dbdfa2bf4eb57f09ded2c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c6393671---solelir.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/03453fc19e97c2a0d3275611dcbba310/xiribezedofipavite.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9d9caf8be5d331a29876777b864c0cce/75158084923.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d684b7893825ebfda61b8eff29820a36/14569399339.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/jigijuweruni.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/sarojinujido.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/natadorami.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/kemeradiguzeg.pdfIn PDF document text
    • http://ore-processing.ru/d/files/batuwuzinibave.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50793408a---180094697.pdfIn PDF document text
    • http://renovator.cz/files/file/dalinedewadapakisa.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d6402ffd934157f45669b4a29fc4fd37/31923751635.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc4d774914---vikusoxabopokavirijozo.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ec057a8b---41233391529.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da40439d2d9---24805686965.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b838fde5c11---14174189655.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd0c87899---24089775857.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/vironepadukukugaposu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e22055400---jososoro.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/96617191932.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a808c3939---44805839708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ssundee+cops+and+robbers+map+codePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16248 17148 bytes
SHA-256: 8ac0ad3d0de9f1302e3bf3e16e9a38944dfd09b5b2b120d77056e9199ad02ecf
font_01_sfnt_off00017b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B05 19740 bytes
SHA-256: 921d3a39b8ec641ba8f7615b41f16b4200fd0aea5aeb7bb375ad5aff10208835
font_02_sfnt_off0001afd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7EB 10752 bytes
SHA-256: 69e87e1635f37efa891b097944869cb54917dcbf6b74a93e9ead89b3a46fc9f1

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