Malicious PDF — malware analysis report

Static analysis result for SHA-256 864112f7184f62ce…

MALICIOUS

PDF

84.7 KB Created: 2021-09-03 22:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9584e7d8ff606b3935ca8d546d7b62a SHA-1: c68f1692fc83f9f837878704c34ffbf686bf834b SHA-256: 864112f7184f62cede8ff7c9288b8b0c09a1f7fd2a838d4c11dc08131df96863
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The PDF structure and link farm characteristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://apz-arte.com/ckfinder/userfiles/files/rowazifokidonakibonelusew.pdf In PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/popagejajobiforu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d723de7c2---43290302582.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/14849708564.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/rurixa.pdfIn PDF document text
    • https://brakos.it/file/7032252447.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-10/20210510064548921186.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/71879926763.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/b55tk16ebtnalhj59ivq6m17q2/pepevafep.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16070fcc73f2ff---30902711681.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/71015775397.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/jogox.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/002oot2chfd42n8ovr47q9o8k4/dazamiwezosapedepa.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/g177g53k2jgrlauvkt2ksdqhj2/xomovofitoni.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/31336554045.pdfIn PDF document text
    • http://bliksis.ru/userfiles/file/vaxorimoxigameletadege.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/revipatop.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/47150192971.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xuxowedadisixalasugezoxi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24e1902b7---10413303252.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160876d339dfbf---35631648145.pdfIn PDF document text
    • http://teknis.it/userfiles/files/61672605203.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/47138486114.pdfIn PDF document text
    • https://mfdesign.hu/files/file/figorixib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=guestcentrix+pms+user+manualPDF 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_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 17992 bytes
SHA-256: 551138d805e5da536f6d03b046216a7a079e46c85e5de608031ce0143a7a117d
font_01_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D41 10656 bytes
SHA-256: a404cec1072aa504a261e40a979ebe382c52a62c57c9c7f6690f91723de9af05

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