Malicious PDF — malware analysis report

Static analysis result for SHA-256 1812f79d1c7bca7a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 16:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4227a3a44dc69a542a8f5df67bf586a SHA-1: 88822614f0bbf725debff10d826503bcba58915b SHA-256: 1812f79d1c7bca7aa9dc241cd2cc95cbfe63a190d185f8ff38d1a56109f44de7
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 ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kozlovka.mebel18.com/uploads/files/bamiloro.pdf In PDF document text
    • http://mega-treid.com/userfiles/files/5305700450.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/ligunadatanitila.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/63512534685.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/jepudotitemololona.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/lamafis.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/domqkrjc935i4bmef7k45nnpof/85878717979.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/tuxirugezegen.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/22322489930.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/bec517664ba920bb013087894a841e6b/22568940107.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/gonunovijapokajoranufuneb.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/texutape.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/jajaxurogelubijojodu.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11020761847.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/82723050584.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/11326647924.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/24724065224.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/teralawapasuvajovofumoj.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/48376319227.pdfIn PDF document text
    • http://canadanur.com/resimler/files/65240499380.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c79d7ed4c---niredomomisilixofimejafu.pdfIn PDF document text
    • http://minhanh.com/files/68206180108.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/wojili.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/tatolufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=onlyfans+account+premiumPDF 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_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 16972 bytes
SHA-256: 8314d76c42d70494e04427bb0826550cabdada1bb5f564251d7547d27d835059
font_01_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 10880 bytes
SHA-256: 7509fa7ecfee5929e171efe38c765b89e59dc34683aa69651444f25c24cc3115
font_02_sfnt_off00011856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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