Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d57395cb600264a…

MALICIOUS

PDF

88.0 KB Created: 2021-07-02 00:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0e0926953b6090dd3f6b1569a3d12b2a SHA-1: c0b9933b6e2377f9643f7adf2441d0297a6e3aa7 SHA-256: 0d57395cb600264a1e3e4d65847155b99b2d9f521300400c8d20158d8350c7a5
236 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it's a link farm and contains a 'ClickFix' social engineering attack, instructing the user to run a command like 'cmd3s9ej3v6551/muradirokuwotejewa.pdf'. This suggests the document is designed to lure users into executing arbitrary commands, likely to download and run a second-stage payload. The embedded URLs point to compromised CMS upload directories, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c96313830c5---57266795411.pdf In PDF document text
    • https://tonitomov.com/picture/file/gakivivapipozi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96de6250c---muparuvenelejeto.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/51dcf4c60639cc289f5aa2facd6a456d/15853746413.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/71818398396.pdfIn PDF document text
    • http://benthanhfarm.com/images/uploads/files/55771088420.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/vupubupoxaratilenabapare.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608477bd16c05---daguloga.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rek34438se9hrl6756ccrjbqto/kowuve.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de496023b9---90871150728.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/valapalo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ahr8asa9md5lj7f6k8j31n7b74/wogakoxak.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/garenoxogopin.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8e27c952007f8e70083758cf087c3cd2/jezetibivukuwek.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-12/20210612052008660653.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/tusatunegiw.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l9h10mqtko5gcmd3s9ej3v6551/muradirokuwotejewa.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160907ab4183f8---manosoz.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824652a01d0---78600170456.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609682c80002c---61669069296.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/12622841961.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210630024654.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d915kd38tj4qulfm9ingam15b6/rusolut.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/65802789591.pdfIn PDF document text
    • http://associacaoguainIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kindle+pdf+not+showing+upPDF 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_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 16760 bytes
SHA-256: aa86c46fd5a0e6b75a203058f74277fb0b39494b94246d650961c8708c54d722
font_01_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 10692 bytes
SHA-256: 689d7019aaf2d0f6b887b7e3f5cc8360d24253868f8d10dc9e6abedd42df4c02
font_02_sfnt_off00013ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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