Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaaa0e3877c56a40…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 23:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72b53527ab51fb7e430ed5d486619fe9 SHA-1: 4db88ad94b1c828d7c01a0f6ed91575ccbfb2d8b SHA-256: eaaa0e3877c56a409a32070263c7dcf2f7cef2521dbe875ba2e48f9e49a174a8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains a link farm pointing to potentially compromised CMS upload storage and exhibits callback phishing characteristics by prompting the user to call a phone number. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content or initiate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://erdenet.mn/userfiles/file/sazefaruvoxedepigorunegex.pdf In PDF document text
    • https://amatnieks.lv/pictures/image/zujekotevodet.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/kakom.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee437d72d1f---kenemedesexaz.pdfIn PDF document text
    • https://argumentua.com/i/file/mabifaletorewumuvasumu.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/5466874677.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/700ecbe4714d4a6854410357c5b55461/lozekifajobifatukolaneg.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c3f9cc9ab---rodazirilutofa.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/nvsimrks5v13hd12qht56t2lj1/lanugaxomizowas.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/vozesukabuxipijev.pdfIn PDF document text
    • http://usagimatur.com/files/others/kupolezifa.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/zutemidibizivot.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/nepolikuwomifexanizup.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0591be4696---binefubifanikegifakefe.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6aba4135cf9619f768ac6de132016347/vitasureragemazex.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/dipipininajurivugive.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/20293829669.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nadulufafabuxi.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/924us1gat280o4jf9kc4ium35f/lixinadevig.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8mba4occ95sci2d90pqh6u4s7l/69106074767.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/ridowageduvatawonulun.pdfIn PDF document text
    • https://hse.tw/upload/file/ligezebogedagemebe.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/1766867649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=psychosocial+support+program+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/turaxo.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_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 11044 bytes
SHA-256: 67b43f1349c9809e9f389ddfac73857a6da0ff9ad39079e844ad5e9cecde1271
font_02_sfnt_off000111ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 17868 bytes
SHA-256: 78710a3c076288dfb1eec3f81dcd15a41719ba7994584dcc4ceaf8b09257377f

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