Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c7bd32089c90c3…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 20:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3ec5251460e68f73c384204ef1b4caa SHA-1: f1988d89100adbd2547aa911883472eef077d03e SHA-256: 21c7bd32089c90c36c1ca35c6214634efca94814e12f620875477e96c0cd4933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the presence of external links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catamma.ru/uplcv?utm_term=natural+science+grade+8+term+3+exam+papers+2019 PDF link annotation
    • http://textingrights.com/userfiles/files/tapivavoviregapufoxolumuf.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/47872183178.pdfIn PDF document text
    • http://tyextractor.com/d/files/basurewusaz.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0fad7d39c---xogedava.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab691271329---53313627415.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/40b511cf3bbac84c8d9c8286a536bed4/20812105969.pdfIn PDF document text
    • https://semut73.com/contents/files/tinubokizipedamo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae87b14a31---losudawusumonugutexogijab.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161275f509b33e---13280130998.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b894ca9c9d4b59e80afefa48913c2bbc/fefimaro.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607343ed07028---50651682230.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/muwegetiben.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/ronusisedejonop.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4027b8c50---23162097857.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/85115895280.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/1140790582.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/33702553931.pdfIn PDF document text
    • https://gilbertems.com/videos/file/sivubisukisowegen.pdfIn PDF document text
    • https://irantruck.ir/data/file/97278079483.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/girugo.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lagamemumomadosifafubujo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17e5edd7bc---72678648769.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e48c8700b4e---56925111249.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/rukazimukitevegulekokan.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_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 11760 bytes
SHA-256: 8fcb2ae6acd13d4c9e4939d3c96dd0f79983dbf7a564ec5d5f7f4fbe04255c80
font_01_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 18324 bytes
SHA-256: dc11e73f521518e1b542c284854b52590ac0d6d5c89b5441895f28460595df3d
font_02_sfnt_off0001315c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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