Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f9bee6e39f89cc…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 06:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d340aaff35053a5be25d42b57b98988 SHA-1: 57a8a0b4e50dc715fdcd43f2151c78dbb6fe348d SHA-256: 84f9bee6e39f89ccf4a1ba7dcf47c1b43dd586cc7718543738fc7876b5659397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic indicate a likely attempt to host phishing pages or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://promocode.lu/userfiles/files/xefubijum.pdf In PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/wibija.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec0b799e58---zuluj.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/ravib.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/87423833867.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210726232232_g3cfbn.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/35a1721b9161d90995b1e4e63e83e608/wavukilir.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/92737770026.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ppfrjlguidghfrhk4u7hj8th5d/tafawolurufamosubawadu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161268213a3b2b---7489688145.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16089d2dfcf31a---kudenibavumexemapazal.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ebabe73786ddca3634e4851b221bd6d0/85934073321.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/samudeledupigudaxagopor.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/592c6c9175029812070b593f5d28ee9a/76407015765.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/pevewexuzumujorodelupek.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/55134455394.pdfIn PDF document text
    • http://iwort.de/userfiles/file/kekikijexiwebafurelad.pdfIn PDF document text
    • http://flexa.cz/docs/file/10605945397.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/21545881808.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/mejinenomatadotuk.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/nizijesezanekuzidiru.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/rimezusibagijediwubowuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tenses+worksheets+for+class+10PDF 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_off0000bc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC74 10656 bytes
SHA-256: 86a6466c61e478fe885283871c6437f6df2a977a51b91f458f45378f13246e76
font_01_sfnt_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 17232 bytes
SHA-256: a2d913de0ca2a49c2df6c403bf69dc2df8a5f4340274e0d77d7fbcd9d7a3f776
font_02_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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