Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9df8207bf1d711…

MALICIOUS

PDF

87.3 KB Created: 2021-07-23 17:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d112a7bf5b29d826ad8235efaa9f04e4 SHA-1: 59895d1be5375f04725b4cfb67515b8effe49c97 SHA-256: 1f9df8207bf1d711bbf3222b12b65ac7d7408c68f6c9bd4d5ae4641e6831bd7a
156 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and ML classifiers, containing numerous links to potentially compromised WordPress sites and other domains. These links likely lead to phishing pages, masquerading as application forms to deceive users. The PDF structure and embedded links suggest an attempt to redirect users to malicious websites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2aca38c50fc5bab71a83a88ea6de56ba/xezak.pdf In PDF document text
    • http://teplolux72.ru/upload/file/8379870219.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/46438799383.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160834d98970cb---50549158825.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/wipufawomizi.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/gefiwuvevef.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/tozejabifodamisovegelu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b8204b4bce9---71051209817.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/rovomezurubixinofuv.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4c4501cc4cf74a623cb77430f9b44542/noroxur.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/jiwize.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/33624749063.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/26364349107.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/lumisusutisudotaji.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/10b4677d376f2e7806bf0a32b3258f76/tovapusowologu.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210708160834_1644288548.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa1371de05---vabozuxabubanasaturadepe.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/810d56850e55a4eea8db53b77ed4d015/75426328844.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8c4274991b05a3fd92076507b3bc3c2d/girite.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/11682093487.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/mdvvbldo2bde7vgsj0esidtu0m/57339178447.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/30581134374.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/88h5tbrh0om5s91f3qav6ugit6/tonisepofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=elangeni+college+online+application+form+for+2021PDF 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_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 18940 bytes
SHA-256: 16df9c1b120270d91fc752be8d3e7a98c68c215429c9a05c914e141bbf08b815
font_01_sfnt_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 10932 bytes
SHA-256: 7bbeb4515d03943d7d9b471d90202edd9dbf0a943227dc00d009ae142a2dced0
font_02_sfnt_off000134f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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