Malicious PDF — malware analysis report

Static analysis result for SHA-256 6051e1c545aee606…

MALICIOUS

PDF

92.9 KB Created: 2021-09-23 19:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 877ed7d7cbd523cc3874cc1c633e3637 SHA-1: 68585bb02285934cbd9fb9c55357dda850c1e5cb SHA-256: 6051e1c545aee606b52b279b39602f425a45c2994e012789ea15b293683f2623
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including one with a 'utm_term' parameter suggesting a lure, points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://podereilmontaleo.it/writable/public/userfiles/file/vobalawatefexaluvumavok.pdf In PDF document text
    • http://romengo.com/ckfinder/userfiles/files/45244572454.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ae7066c938591339e4517999d1132122/fapexudo.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/11854642062.pdfIn PDF document text
    • http://vuason.vn/upload/files/70784104251.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/zemavurolupuxoguse.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/robidoperokonemaxuzizela.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210911001726.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/sadiwisonapenoxaditumod.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/juvoduzusituva.pdfIn PDF document text
    • http://uchid.com/uploads/file/36161502628.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/kotitasa.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/35809093388.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/59575633791.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/zurizisogadizixumomagex.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/mizodisamosanedolelaguti.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/4011458018.pdfIn PDF document text
    • http://www.andreapondika.cz/file/nogojuvujok.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021912_45254_793.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574ac5c058---95914000562.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b2f9151e4---kimajitaveri.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d04e8445---96068561724.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/9635197354.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/mekupu.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/41343774685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=my+talking+tom+friends+unlimited+moneyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000102f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x102F4 18232 bytes
SHA-256: 182694dcc4955b3e0578dacf3112128def0a670cb8cb7bab9067e27debb83aee
font_00_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 10996 bytes
SHA-256: 569e3dd6c7282b2f7fe998224284fb8df0e122609a51a267ad9a354bb39dd729
font_02_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 17400 bytes
SHA-256: 9ee977d599418afa6f8b1eab987df595572191da29767e8c08573cc11843b442
font_03_sfnt_off00014d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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