Malicious PDF — malware analysis report

Static analysis result for SHA-256 562ae233d32ec05c…

MALICIOUS

PDF

98.3 KB Created: 2021-06-28 23:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcf63672ddc0fc976ab4357d02f59116 SHA-1: cecb6d8e3a4bcbfacd3d68ad73c481381e489532 SHA-256: 562ae233d32ec05c3c32daafa15e1fd586c6dc58a4eaff3b945137fd17b3f987
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nomylo.ru/uplcv?utm_term=dechambeau+before+and+after
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/f94ae89ff4c4e7f0d1a8145fe4e080e9/66199683812.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/66r32fj211nugspsggtqcooj5s/58208348874.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609071032a067---65560283558.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/zemowesenuno.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832781c4350---fobuzomakadosizitase.pdf
    • http://altinay-law.com/images/file/86959599139.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784b28c2d22---39792418789.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/4k9asqqa9r5dk1ns7h0dd1u3ia/japegemogilasogadejeg.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e60399e87---kizilededurate.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/h430o1ps2av45luliea82qqkt2/majadefexoto.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/26b9f219a3aecb63b91cc4c6e9df08e4/jujoxatimiw.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/darajevuwilanuk.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608163e5eb467---jijatafipigen.pdf
    • https://alihuata.com/userfiles/file/80060980475.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/duwiwu.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a75238d3671---59087683042.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c936f2ec9078cecf1b15611b6bd75c3c/32740827352.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16080bcdf3b19b---49253698992.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/07190e3cd40c36485ecdc635d3ba4a81/75048812605.pdf
    • http://acecaalcoy.com/userfiles/file/xulatujuzubokirures.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/0erkesf969001sgs5dbvm30ib7/mezuxutizusefedipeniw.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_off00011d0a.bin
c3d7610ee3e24db80434e61475caa43fbd6f5c1b846a9a5efd5fd7ad4894d3ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 17776 bytes
font_01_sfnt_off00014bcb.bin
f972577cb17e84f53d5442ed27edf58bb8c2c3bca8b4fee4141c4e8f91e8f1d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCB 10676 bytes
font_02_sfnt_off00016412.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16412 16792 bytes