Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c1f57d87ecb5cb…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 02:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: debd28b041338b2e84d9fa9f38b92a80 SHA-1: 99a830176aa519a4a167e83b59c84b3893204ac8 SHA-256: 42c1f57d87ecb5cb49df194ae7b1f6001980700497d38e5dbe0ab45cf8c80119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://laborke.ru/uplcv?utm_term=rolf+potts+vagabonding+pdf PDF link annotation
    • http://allmedicus.com/userfiles/file/somopununijawe.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ihmfnaf11s5b1lubrjbcq7utl0/ruregidajofavuwam.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/83423557347.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c12b7d701---fefubo.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/guvapakelifeleju.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/6601618005.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af779795260---70187367261.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c0e893239b7b7ecf9ab8512f2941b8e0/pijajoxabukob.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/mabibawutelaporakoku.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/0ae80455e64c48df1b0cfa644d5be5d3/15704272998.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/2q2apoaj2ps9vvejp77upv8qml/34271193943.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/51437276511.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/94404607508.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced4fd5f5f---31832917498.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/fedixotojeriv.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/roludupirabiw.pdfIn PDF document text
    • http://belovosushi.ru/files/48176175217.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3501299694.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/fezupegudor.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a50625a0116---85051279723.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d74e96474de---nasisugadatakigida.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/94507587743.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/25386238670.pdfIn PDF document text
    • http://iphysiology.ru/upload/47037924384.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f346350d20---soloxanozijenuneti.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_off0000c618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC618 19320 bytes
SHA-256: 49c24953dbea2cfbb4ea1116fe493e12379798a3c1c4e25a86d6b3dea01bc39c
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 10692 bytes
SHA-256: 36e4e5cde7f50c087f4a07be096cad5019838b8b30c58ad7dc70cfb624b0d5c4
font_02_sfnt_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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