Malicious PDF — malware analysis report

Static analysis result for SHA-256 079389d3db689fd6…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 23:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c69e3fbdd55ccc8e8e629a98d4b63090 SHA-1: 7e6409e8993d817f30b3c0a1693d5b3c010aedb2 SHA-256: 079389d3db689fd61f1e3f5e2bd6b314d1ec6c2d64a6643d2ed8a7a3f11071ef
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack designed to trick the user into executing commands, likely to download and run a secondary payload. The numerous URLs pointing to compromised CMS upload storage and disposable hosting suggest a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://ettorebelfioreliutaio.it/userfiles/files/65119342277.pdf In PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d2d2f7d6200978b9d38c5796c220c782/66458530983.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/b8eba3fe028defffbd08b9ee68e44ab7/natosifutawekekemesu.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/17441891190.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f9ef2d2f2---68132944191.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/81416076337.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1f9fe9b54977ef25f8b1755c5e4e5f35/37662552714.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/60415534336.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/44603138517.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607586501202b---taresomirazajosegon.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/zasadufajubosugadi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd9f10c17a---pumafojonotaporigikopu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609182b3e6d37---71673268781.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c8f373419---31317212054.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ogaru0873tkivlc4372eclr057/rusaxebaxifoluzelavusug.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075855b21126---67762117617.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xozizitugifilod.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/84990766466.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/74879980897.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/57e42682c56514c29f4b54317d7d389a/79223083711.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cfsd2op1ncomkgvf03s922mou1/76403787158.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c168dbdc7ac---desupolotopaduguzukob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+security+database+on+the+server+does+not+have+a+computer+account+for+this+workstation+trust+relationshipPDF 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_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 11448 bytes
SHA-256: a0ea482cabbe9b6b0805b2f34bd04f8287a2584d39b2a55568eedfade4afedba
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 20220 bytes
SHA-256: ff6e31bdbd2d4fb3a28e82ae63e85d1c88402c0590c2be37129aab3ffd4dd19c
font_02_sfnt_off000137ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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