Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2039468735ba79…

MALICIOUS

PDF

104.8 KB Created: 2021-07-09 12:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8320e8cc3e6e287b21e743ad8513adbe SHA-1: e8a6bb0336f0577272141c64d97198a09b6e8c43 SHA-256: 2c2039468735ba79262d59e1618e639bd82a799f51f5c2dc0c044f6f8291ea27
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics and ClamAV as malicious, specifically a phishing or trojan variant. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into providing sensitive recovery information. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it acts as a lure, likely leading to a phishing page or a further stage of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://yizhu580.com/ckfinder/userfiles/files/vujujapuxoginugejezojiw.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/sjm9koundiplmti8hgd37p5qho/66055824980.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/24197092488.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/wogirag.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac855a1b73---jojepenukunulu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608426c186c6c---garinari.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799271cd3da---12757046903.pdfIn PDF document text
    • http://2440027.ru/upload/file/jurefarekejokabite.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/thbhve5rq106n1k9t2tkpnu3s3/xusofusujugupebuzutapekan.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d6b68c58d0182df3a49b7d193d1ed271/83875515163.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963466bd3a5---zonanalupojidoxarozeb.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5a2c2a759f54784a55c52617cae7de0c/20402266623.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/wimuxozolemeso.pdfIn PDF document text
    • http://demkapi.com/resimler/files/55409537088.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6ac38c6cded0328a9794db888c78e1ba/butipoxesavixofixa.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820ddf10940---pesaliwafosotovitufomim.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8f5a413da25c0ac15b4beb22cfb688d7/kuzilifonodibezekinek.pdfIn PDF document text
    • http://e-hematologica.com/users//file/raxuwelabibijefugonunix.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/sagaguxeguro.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e3f1d07f0d423182a139cceabaa1b03f/mozatuxeweforem.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/45675804402.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/2kdmm6efkb39khj8aufls24sgi/xixilokotukomofebaru.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f579398713---dibixafubumafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+sign+digital+signature+on+pdfPDF 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_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5D 18536 bytes
SHA-256: 17c14a522c1e668508fc5dbc615e3ee3e417038cdf122e77df14a4eb2e666402
font_02_sfnt_off00017cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CDA 10852 bytes
SHA-256: 1c55ba55292756f0c20443e932aaf758341d1682cfbbdd12c3f7452581fdbd66

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