Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb0b370c1aa74ea…

MALICIOUS

PDF

112.3 KB Created: 2021-09-04 23:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25babeac85bb3fe31870285afb40eec0 SHA-1: fd7c27a5447ef2a982d60fff51bef7aff8eb22cb SHA-256: 5cb0b370c1aa74ea87365774292fba992ba0695a10cb7071719fb486ecb151b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the embedded JavaScript and the numerous URLs. The primary attack pattern involves luring the user through a link farm to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://casavacanzesanvito.eu/userfiles/files/gomukufodizi.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2ov20l12k455utjtuuno9kjnqd/27941072202.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/85172583786.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f56399d856---sogiviwipoxeli.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/37214282078.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161153e35624db---kokewavefubamudunuxab.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202108/file/giwirakezulasezaxiwevoz.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/85073505158.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/13516194843.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f74c8015---67560831320.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/19896318237.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/28915797714.pdfIn PDF document text
    • http://kd-council.com/upfile/files/jupijalobid.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/detivelomewurorumif.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f87521a97cc2d0310466fe9b47643d52/16155891076.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7af518f641---94678409130.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210626085311133.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021073101542873499.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7f62a3620611db938ae5b2f888301502/78950405313.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210620_F4519FC6B357EAEC.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/42524323523.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/70367498435.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2dd08471b5b8fbc1621cd59629a5283c/kakuwoniliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=antrenmanlarla+geometri+pdf+2019PDF 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_off00015852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15852 11116 bytes
SHA-256: e32cdbef9d44509e162c899a1663837deac306fe20392251817112db7ea40ede
font_01_sfnt_off0001721f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1721F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A31 16868 bytes
SHA-256: b5ea8728755825b07849a22c8d2cbc24e02e02eff05b2eb4d36fac13c3a93d69

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