Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bc6adf32c82d20…

MALICIOUS

PDF

89.2 KB Created: 2021-09-07 10:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 20c0b37ca1ec479502f7c821fecadf4d SHA-1: 48d6d758f36c8d32b66b0f1dd5a48369c7ae4717 SHA-256: e1bc6adf32c82d2030842c9d23f2a657c79459945fb22d669bd83b5cf335e8a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=flask+web+development+2nd+edition+by+miguel+grinberg+pdf PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dddf0eef6ec---67716966723.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/xewaremebasazotadipimav.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924cb84a895---zajinere.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c57976f54---ripijamajorepisirutesovav.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607709be5aa25---jatazu.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/sidosepikazote.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c44c6ec48a9---sinalagoluporotanuna.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da1d61670---xirusokisovoludilonokojat.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/biwadisizawef.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/39594225148.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092e0c6a07c4---jarazafokonibigejipadaxu.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/30831654548.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b99f184e2ef256622aa2ba79034d90d4/62486611840.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/pigomupitisidan.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/08/file/202108090615244112.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/wefijupegegazolo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda6baabe19---41074097244.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075792da2c34---15183934841.pdfIn PDF document text
    • http://poultech.net/d/files/foxelowugujila.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/5582201321.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tnv67qq3j637lcfchotcc376ie/jotoduxaxepiwo.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/32636cslrkokfng6hhu3m81k78/36931450317.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/27185590832.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d43860260---felarolidekuradiwofukuw.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_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 18996 bytes
SHA-256: c9da0ed43e9110b03c36a7f3c9b3c305e4628a159d4c4fb2a9dda0530b79a6a9
font_01_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 11536 bytes
SHA-256: 2eaaa4db004054dd156a4915b19cd16691899d4fe42a96644941ef88763ec747
font_02_sfnt_off00013e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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