Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a67820f301e53ef…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 08:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f62c208485a3e63c7ddc767e4274fb86 SHA-1: 9e00507f70f80fc38dba866d4ddbdab3dbaa8c0e SHA-256: 1a67820f301e53efa42deefb3aa59b8f1f4f448a7c546e67c32f5fe474969bc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, pointing towards a phishing or malware distribution scheme.

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://crysiq.ru/uplcv?utm_term=construction+planning+and+management+book+pdf PDF link annotation
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/14943495098.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/dadesavorimevapiriki.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/18523320740.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134555127f1b---43918861562.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/54820624470.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/nofebigipix.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341694ca4b6---62050415750.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/zaginubuvofowameledasapiz.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135297680c86---tusixegiwuxuluxuduxivol.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/powefebemodisisoludemosi.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/xufobawokaxumawufikowafi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/47311beb114b70e4aefdd35bb555bfbe/15241162551.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/80067098209.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/37856947332.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/8415378568.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/rifarur.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/26756781613.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/kimipuwakigu.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/sobuvopirugalesemixabi.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/5692636023.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4ca9016391d3e289730492e615cfd4de/80055792439.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/diibq6qorjikugs37blchjelcu/lobagefuripekudive.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_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 17480 bytes
SHA-256: d5ac0af651bd5f709df2435004d405ba2b4796365b17a844f803a38c371517fc
font_01_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 11324 bytes
SHA-256: c39cdce5109745317c9fc730194c90c4224cb79a318404d781aa5bf0265bf7f3
font_02_sfnt_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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