Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e72b0905e3ce5d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 07:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69b512819d3995fff9794854b24467df SHA-1: 12b52ad37e2ff46ce0ca6152dee98e7e9e86bb61 SHA-256: f7e72b0905e3ce5d5282f323d086aceebd014f3c6c7aa549fcb98dbd3fedb9c3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or malicious files, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and compromised CMS upload links reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=probability+addition+rule+worksheet PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/38aa6b89fa5c15368bb6f8d52caf9d20/nitetiwesimigofodibimav.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/p5d4p4rlomisdt7pqi13gkgfme/paferidow.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d710dcdb94---24574802421.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/pubazoloximudovuli.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0b32d4d3edff9e327ec93a4cd788d08c/89556396131.pdfIn PDF document text
    • https://0900107678.com/upload/file/79051994465.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/mcaf5ugq85bgiv11h8i1h5cl4a/91297945621.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/uke12rfb9hjlsabc0bou0td0dc/93358681196.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/jajenubumulelebat.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/12538046372.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe389e3c1e---rikomenaletumifiwesiz.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/73760990764.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd973559d6a---sogofarex.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/ed8ab26890f9d2b60c41a4c759b1f2ed/putusoj.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/jixaxezaworoze.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/95809314869.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/gid6g0kqruddetck9cg9dk9kl1/wumewekolimedag.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d580b67a76---papawopumudokotumexirigi.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/6bb7b69552dcf12977b887be83c65f18/18711510158.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/79409630812.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/zoxorid.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/32925956483.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_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 17732 bytes
SHA-256: 1d8c4e56185f2eec179b5d3411f77cb58d071e488764f6611b2106bca25620b4
font_01_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 10876 bytes
SHA-256: a66fb07794cec4e08abc7abda40c356552d75cb07912a9e6fe47c8175b8451ba
font_02_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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