Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f116ee381c3b28e…

MALICIOUS

PDF

100.8 KB Created: 2021-07-02 01:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3b56238045b7956f585abb86d72d66c3 SHA-1: 28780a5431d0bb2099e0240c8e9902b638e75b66 SHA-256: 7f116ee381c3b28e46552d07580f242be2df039bbc97cdaba18b2288256bc00c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=accept+except+expect PDF link annotation
    • http://maslatalaia.com/userfiles/file/5809567749.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bd65b455b---95285236102.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/d406d231a73bbe47512b3d8889666f37/3452003322.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/7d823cf294418a22d3a6f0e71f2d5a20/9407626255.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/4459cf97ba1bd6281a7aabf87f9e99aa/dezevarowaxitixuxigedon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcbfe15071---83747065385.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/32255240761.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bl3pvmigf8mtlq628n9o0oa0mo/gebanutazag.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/54597473135.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/29964435785.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/98322939244.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/sofixerufisodike.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/i3v0k03hbd4il9d70tmoa1ntk1/zimokupunat.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf2fc20348---bamegeluzurol.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1a6c7f3e39a85e2773dac61e05bf3c49/jidazamunaxelawumotura.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/86330561dfaac2b2c4678591002dffab/83148347639.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/03d79953dc0e971011e09f22ef1680db/setumetijelovejote.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sng1kt9cnbq31ivhj6b5b6vief/86236631534.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f68d01b9c---xejefupavokukawa.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4pm2me01s47bsgpdm23upatjbn/77191748422.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983c4359efe---jutegamoguxopexujuveti.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/pevabapufekubiwirusij.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_off00012ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000142c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C8 9660 bytes
SHA-256: 99a9f5ff6ca99917adb29a6743ad8757aa75f4437a287da1ee02ad49cccadf9f
font_02_sfnt_off000157e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E2 17316 bytes
SHA-256: bc1f44c0ff0b6275123048b2a9fd20014f2b4a22c29ea1b1f49cb5ab3fa1e5c7

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