Malicious PDF — malware analysis report

Static analysis result for SHA-256 151c1393f25bffd2…

MALICIOUS

PDF

91.3 KB Created: 2021-09-09 08:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ce00812f3b589b3911b186a5edebe04 SHA-1: c068d71c7efdefdd2dfa9608ff9ac78aeeabd57a SHA-256: 151c1393f25bffd260d523b66ba595b73db3a1c004792e96a254cf992a651bb5
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://philabc.ru/uplcv?utm_term=kubla+khan+poem+theme PDF link annotation
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351bd62595f---raxiz.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/70429611971.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/2703408889.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/kolajelox.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135659475f54---59523587121.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/rawixutubuxokugagitok.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/wewoxudipiviso.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/67639749420.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1413862f4253f5542927bc001d8bf5d1/58213420568.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/72732043589.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/bowamu.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/21255087372.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/koxepufadunejuvurego.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/56166635897.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/jekenanoloxiwenogeja.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/nixabivedobewib.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/57655125769.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/minukufenidutuparo.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/39033675359.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/28524502452.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/74446209747.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/dipiladeruvaxe.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/nidolujexenu.pdfIn PDF document text
    • http://retailcop.ca/files/miwumevalexinidakozokafe.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/72886892732.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_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 10480 bytes
SHA-256: d49bee7c06cca11a94519ccabac4cedc288f37b238fd5b7cd644edd83fdf10ae
font_01_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C0 17892 bytes
SHA-256: 0fabaa289a646244a8a20d7c544b966ba01ebef7c2ddca253c2bc732525c6cb2

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