Malicious PDF — malware analysis report

Static analysis result for SHA-256 2465c4164f15b260…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 12:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a055220e663c8ed57546c14ec6aa094 SHA-1: d46ad5291afa3a5b7a5f5132c3dbc574529ffc7d SHA-256: 2465c4164f15b260e7f09ea0e8f9c9b16ed5da2ba2cccdfc7709ac3ab982c268
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the use of the document as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://moda-minulosti.cz/docs/momin/file/xabanepeso.pdf In PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/nadeximixakano.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/senosukijenorerikixuk.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1e7d4de0a86044e63f5220228fcd53c9/44883258568.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ponajatofafaxij.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/90780261222.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c55d07aa---59391578087.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160942f9b0a6b6---53042445787.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a1815156---99226635804.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/43322240431.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dojimawamiwisedoxemubox.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/g2n2j2ub21n7t3avu43tehi1q7/pufixided.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/vuxivosomivobigexizid.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/sevutuga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc7d9645f10---44407734767.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dc8550c04ba43084f39c59a912d7769d/44370959726.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210818_EC72C365F767D1C6.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/liveguxog.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b490f5943fe---julakadabuk.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/pitolejug.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/sebesemarodonikisopelox.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/zifas.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085049ba3713---1260114748.pdfIn PDF document text
    • http://szm.hu/userfiles/file/nukabulafo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/72279278890.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/tofokutugudekulofomagalub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=avril+lavigne+and+brody+jennerPDF 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_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 10588 bytes
SHA-256: b643814ba7fabba9cb071eb2a885aa6dd64a948ccef7191345612daddbf98099
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 19168 bytes
SHA-256: 8b44dee32531dea3559b3f2590b3f61164256a7a37c3fef695cdfbeadb46aeaf

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