Malicious PDF — malware analysis report

Static analysis result for SHA-256 8659d23b6327ecfa…

MALICIOUS

PDF

82.4 KB Created: 2021-08-26 10:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 265112384c12de5303f4b33cc9e2ba18 SHA-1: 104845d648a56e7a48173de20ad7e39a3bf6fa7d SHA-256: 8659d23b6327ecfa811609029dcd9a17accfbab935057f4c45bfcfe46d487969
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The 'SE_CLICKFIX' heuristic suggests the document employs social engineering to prompt the user to execute a command, a common tactic for bypassing macro restrictions. While no scripts were directly extracted, the embedded URLs and link farm heuristics point to the document's role in directing users to malicious content, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://mariapolis.net/ckfinder/userfiles/files/xekoditokode.pdf In PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/zerilowo.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/xabun.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/laxizogusabezumogerone.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/jirezawazekujatexegafepoj.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/zowilamonekajujufasaw.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce5183e5b---65286548825.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/44d86650308badfba08df1ad4a326d5b/xamupijip.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/33730397990.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/tedutifovumejus.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/zonefigavigo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b2430e5adf5f1c8c617ffe0123f6e256/femabazibire.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/75855307482.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/kevonudo.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210725080823_6a5580.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/30326549383.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8551c6146---sipibajefuwirizewusuwefuf.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/zewud.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4883db8843---wivugo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2719d673---88242490551.pdfIn PDF document text
    • http://salt17.com/userfiles/files/57524747775.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c78a576fc---kibuzogejakimagugete.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2eca9a6fec1ad7635284f07a1f4e7f7c/rutilebarokuton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=directx+level+10.0+downloadPDF 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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 16780 bytes
SHA-256: bef712d47f7537bea8c341284a33e6faf2f5739578ebded1e32b006065cc1778
font_02_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 10688 bytes
SHA-256: b9dd003b15f3bd107061bb4fa086ea812b076d851e661c3599dc9c8e8d0abf89

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