Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1acd226585ee9e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 10:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 676208012bcd1daa9682890e2b3cbee1 SHA-1: 221c8ce46ee6c185df6be3173db29e4b3392c40b SHA-256: ce1acd226585ee9e0ee5a880340ed72cf9661c9d88b7a370cec44e36ec07c69e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support its role as a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=printable+12+month+calendar+2019+pdf PDF link annotation
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/35498424748.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/sedobamudinikexifoja.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/13043232030.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/tidukoruvuwuroguzusijuzim.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/zusoxojegege.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/komisowemux.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608251d30c3e0---20003280227.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/saxenizal.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9282dffa6---49356586585.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/u9oh99m7fdk8rq9e9osguk9gi6/52827090534.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e81d2556dfeca1c7e698233f1f10b6df/sidunugaxulotomu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161211a2fd5eb5---67229961849.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/badovat.pdfPDF link annotation
    • http://gediklimakinahidrolik.com/resimler/files/zorudedenezuxanubatowupuv.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/saxuwaku.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/foledaruwadeve.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610314d117e95---11483447915.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/46180878532.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de1711d375d---76830285591.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/xotowimetojiwa.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161100d602b911---6733741199.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6d900828c---87900168982.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/82282283647.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51667c0cfa---14097693803.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1cfc5b34f---6028184166.pdfIn PDF document text
    • 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_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 19616 bytes
SHA-256: f9ea4524b642ce44291879b13a352dfd13de96886c52619c886983c34b4f61cb
font_01_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 11320 bytes
SHA-256: 963f22d5c453f7b6ab25062b812e9bfe51e4b5d08be708be3114193e49d925ef
font_02_sfnt_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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