Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1b916e52ec17f6…

MALICIOUS

PDF

143.0 KB Created: 2021-06-24 22:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 498bdbefc3a576b4e183691199f8688f SHA-1: 37ef19b822c10cc7fbda6a9b3de57575877e4a0b SHA-256: 3d1b916e52ec17f63cc2a86fdce5f061672666875a4f14fdd5125a4e758ea2f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to gaming, further supporting a phishing or scamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://capitolmetrophysicaltherapy.com/userfiles/file/46621108649.pdf In PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/uhtl8hjmvi6nekhi1g5ajk7mo1/vatezi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49229c91a---fitikajutowilox.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0b361b9434dc76647ead778ce59d9f3d/dojedetuxi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/356ppjfvfb9masc35j11ajifg5/gimiwite.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d79267ab6b0ea34fae60a5c8b5ce9934/66236712193.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8cf2c868---34701849325.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3dad6631---lemowur.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/66012015359.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079d83b21409---sogesalidejodapa.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/62286109041.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/au011dhv3esmr3g22q3duf14g8/xilorogitisofozuwigawu.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/98516129323.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/u4g8d5d3071bn1mgsj4s9s2cg3/86118187510.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9badaf804---werapuruwefewakulan.pdfIn PDF document text
    • https://irantruck.ir/data/file/fijuwibufovarukedixozati.pdfIn PDF document text
    • https://castel.ro/userfiles/file/9983331724.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/pupobelibetevupenuraweki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+play+breath+of+the+wild+on+pcPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B564 18352 bytes
SHA-256: b1929db807dbfbfec96ed9083c4aede4c8bf9ad2bbbf90bff3662f952bd00bd1
font_01_sfnt_off0001f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0C0 5360 bytes
SHA-256: d9d42d2a97edf0280d0322fb16358c4396b85815ee54c996d4f32cd32a4399cd
font_02_sfnt_off00020305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20305 12640 bytes
SHA-256: 916b9a71d563056db1382f98118e65b5fa77eddc887af258de70d8940378bd32

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