Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb85026872f5866…

MALICIOUS

PDF

86.3 KB Created: 2021-09-07 15:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ebb73b73a0809c862d7d691ef289189f SHA-1: 0d7f0bc742880bb1bbbd234260984a4fd3f4bcd9 SHA-256: 4bb85026872f5866763c84ade40439008d09572cdb29787306dbcd9513d8d8fc
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fec2eb0af---vekibuwerinupadiza.pdf In PDF document text
    • http://supermarketdv.ru/files/file/ponafubafagizopadeb.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/remadatetog.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16072e31fc54b8---garumutom.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b5d6d91c---24805290312.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d523017d9---27279581428.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee34556b7df---56007499189.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/pukatadovukurexem.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf7cac0d3---genenetinebuxuvo.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d74dfe518f---3400051399.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609850111faa3---88166032327.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679276ab7c---4547929236.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfbfd04d0d---namiterin.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/22979167577.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a12c672bb2ac677f8d75819279de9dcc/roxuzatidix.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/dipuko.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/netamakajufulodiza.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/49435045611.pdfIn PDF document text
    • https://peterdegendt.be/file/74633431590.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611b4a6cdd3f0---munubaniro.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/wuritinikuxogukusitake.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/nqir8gusa0118jktmkpo2tsbi9/46980933168.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccaa11bde---gewasesaji.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d62a14f8---79572285029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=definicion+de+coherencia+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_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 10408 bytes
SHA-256: a624f48fc617fa40f3448dc1052f50698318c9fe967cfd1c9d17da9e6f130048
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 20248 bytes
SHA-256: da28821aed609e9f0563da51a255edf9183b9dd7be7fdcd75269a72e322623c8

Open this report in the interactive analyzer, or submit your own file for analysis.