Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b208b74d864bea1…

MALICIOUS

PDF

74.9 KB Created: 2021-07-05 12:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3b21a847ba89a004e9f68bb6ff15a33c SHA-1: ffc60d36f3dc6eb12a3e6db46f63b1c380a3d1d1 SHA-256: 1b208b74d864bea1792ab00f5e7bd5e67a4d967e960af8d41bd30da95343f9a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/pc53226vpocdeqfkkj6st3jhqr/pexoledolaxovakogu.pdf In PDF document text
    • http://artospace.com/pics/file/74049249048.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/lesuzoguxufarosal.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ba04bf9920ea3d7b95a23c0f823f3e4/misevowuzasezoxag.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079038163500---werovupabavabaziki.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/mogipexanuravexezogiti.pdfIn PDF document text
    • http://moristas.com/userfiles/files/mufarikomi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04b768eadd---fefer.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/77659211379.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/901dfe60f08bdacdfdb6dfa1936d8271/nazedewanojegu.pdfIn PDF document text
    • https://airshow-bg.com/file/zubejo.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/61708258048.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/e08nfbaq5pepgpjv0jom135vsj/15741410839.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079abb2cd491---17913272306.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/41120925755.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/68774957785.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/lejalonuzixujege.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/mixugavumeju.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/56317328603.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/aus5sp4o1269bek2egomcsfcp9/56178042164.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5606b48f---lufubapenadoxo.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/rutaxexoxaloti.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf4e45ab6---godofutiwifulopiwez.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/98d4ef3ac82e8cbfe8ebdd4589697cee/99900310348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=penguin+painting+on+wallPDF 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://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_off0000c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E6 10348 bytes
SHA-256: 7297ba73851a5a2348a5e4f4b90abb26b2f45140853118ca26f2fce798c83c0d
font_01_sfnt_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 16316 bytes
SHA-256: 93138bbdac26ba5e48d3f8db7011f3630cda4a907a582437613ef2b7317b3cc0
font_02_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1