Malicious PDF — malware analysis report

Static analysis result for SHA-256 067a5ea4b05ff1a5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 05:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47391e16faa4015105f93837e4b5f58a SHA-1: d6278ed82636d6f3fe92558b1e44508cc2446502 SHA-256: 067a5ea4b05ff1a5ca0f2ba3321df71a55e7a981b6d09fbcb277d07371b76f31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs indicates an attempt to direct users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=crash+course+world+history+ancient+egypt+worksheet PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac687a72216---kotetubonewe.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b22a32a7704---8249819250.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/vakimirevofuge.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/54dfcf8df6871c9344b5bb032e4d8217/mujuvoniluwuzigakuze.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/jobesirokozinerijigena.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/15253339829.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/78405933464.pdfIn PDF document text
    • https://beliangka.com/contents//files/3367576636.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a581cde6b3b---dubuvolebewilavuj.pdfIn PDF document text
    • https://makenie.com/upload/files/nuxeterada.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/4119ab576c625c61c766cee8a9c28bb0/witenovoputujexutegiwafa.pdfIn PDF document text
    • http://asfalon.com/__files/file/bakawolarominuwozuwigu.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zifadebotuvuraf.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/72403925203.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608753ea358dc---rojumonumorovudawus.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/79739265178.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/80dff534523d367abc3df1c157a9f071/kefexikix.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/6nsng1tec3ekq0hlps0a1vkt8a/wobotixojopozijifavubus.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/69275805843.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/65029014725.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dfb695a30---65399871081.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/55286395232.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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 16276 bytes
SHA-256: 3c0b790cd9d5c9a24045237426657a060453d109e089f4f3cfc8ab5d75e7e2b6
font_02_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 11216 bytes
SHA-256: 7450b2394de30e65e92121a58e811e580075d339d2aabf3191f48ab772c1a45e

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