Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fbb7c6697489f7…

MALICIOUS

PDF

92.9 KB Created: 2021-06-10 19:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0a10f8827f08803a092f728a8f56497a SHA-1: 88c740f137edf9585751b9da36750febc98d3a41 SHA-256: 72fbb7c6697489f7605ba71802b16d339645a93ac97eea1e9011d45efbfb94fb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs and the PDF structure strongly suggest an attempt to trick users into visiting malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=khorkuto+star+jalsha+serial PDF link annotation
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/tugovas.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/71392819242.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609970e2f1296---rewufiliponupigibomewa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097395aa73de---mopizegunuruwegebavojupo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a226c0244e8---72303362622.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/va4279ra9depa5neiokv1nieg3/rukuligonamomekikobuxular.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ec807e18696b5df61090d48a20cf94b2/rifizezidorofu.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wununikemitet.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/mokeduv.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/vujogokazurajutifugubak.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f57504e8---75769213713.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071106e8f3f9---wukasidu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d384715f4bac1aefe9b8c73977a2ccdc/xenogasuzivukama.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/603daa9f3ec087f8cfc1ec7b463efc9e/50945845389.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/jaxenirojibemabogewogi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f8519cc461c21731708fa89847a603b9/gifoxopijugipemati.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/791a2247d55404aae2fc9a1ac82299f1/jajuwuribarejurisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 4880 bytes
SHA-256: 72e63e1b89957186a188809e7915ab41a8a193d00d34d90a669c76f906614f4e
font_01_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 7920 bytes
SHA-256: 56a06817e0d13b2184472a7b50f71f31ace57ea60bc5b3970594ff87cbae4d0b
font_02_sfnt_off00014189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14189 10704 bytes
SHA-256: d22ebeb49e294c626acfc5cfa08153a3753bec9fa6ab175bb39c5bf72e7e04c7

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