Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8ec08ab89bbb0e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 10:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2e2e30a96d517c1e9ff0b36fb7f4771 SHA-1: 5612ff90c86a2a4ed39b60777d688fd0a39bff97 SHA-256: bf8ec08ab89bbb0ee9a6593b89ca4eb01c38ec675cbadf395d69d59c56c6f19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress sites and disposable hosting. The primary purpose appears to be directing users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=football+manager+2020+apk+pc PDF link annotation
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9e69546a0983b9f2975720ba7b541968/negapaj.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/48101060401.pdfIn PDF document text
    • https://mszukam.pl/dat//file/sanuvufivigarotabimoki.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/wimajivarufubitedomow.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/oe9691bdmp51snk02sbn93cue6/30746031135.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ea1a02fae34ae07f0ae2422c8ef9b87d/bimutufajobudusutiso.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5766422bd3---govabefokomox.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/bukodefuxitizobebebagul.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/80309452434.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/1862716563.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/71523100355.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/19687109568.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021617028482986.pdfIn PDF document text
    • https://vestol.bg/files/file/bufaxanukif.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161208b64bfd55---vorepitekixobonutodex.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/zilubeb.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b8a2083d---kotoximax.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1tur7377udb9l1lbtthrrq4gb0/96899699396.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161276d10069f6---89628406351.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/rjn8oee2cq37442r8e3bdet1mm/paneganaduv.pdfIn PDF document text
    • https://maria-galland.ru/files/file/gakomiwupilajojapi.pdfIn PDF document text
    • http://utopbrake.com/uploadfile/files/15159948617.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd965b47f---40938455434.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_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 10908 bytes
SHA-256: 16dd3cf3e204f44217dd324228cf6057c76d03db76830779d728ea9fa97ba4fd
font_01_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 17796 bytes
SHA-256: f318a4122b88cfbdea74fe491a757fee6b49a08950ac94a911e75dbb7fd9e34b
font_02_sfnt_off000122f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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