Malicious PDF — malware analysis report

Static analysis result for SHA-256 326eb6daf573e79b…

MALICIOUS

PDF

91.4 KB Created: 2021-06-30 05:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8384e9901a6c65e3ae9ad6c0b8a3c1d SHA-1: 49872d81625b03b233260650f93bb87005e60838 SHA-256: 326eb6daf573e79b1f2da734c14b43f3e3eb7fa9b217f8bb51fbd5890a773f14
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Credentials

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing infrastructure. The 'SE_MFA_LURE' heuristic indicates the document's content is designed to harvest credentials by impersonating a service requiring multi-factor authentication or one-time codes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://wastran.ru/uplcv?utm_term=how+do+you+change+your+fortnite+name+on+switch
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0672422760fcfb19121f77f570421ecd/wufiganulevunudopav.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc32f5b65c---tujopuxulisidarize.pdf
    • https://africanresearchcenter.com/userfiles/file/xafubajepumi.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/d911ba9e82df23973e5551c72cc3e017/47345952926.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba1f65c72---zobipokabipakonanisatu.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1498cfbb91b109b0fde5661f3ec2477f/12446305274.pdf
    • https://retake.dk/ckfinder/userfiles/files/81023722794.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e22fe51ed7c4cf67610a279ab37a0fef/nofizeko.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/xinefudobexete.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609db139b7cc6---2029049543.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7fcc7e3cf---4827795079.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918a7cd4309---61659953801.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f901f68ac3---muxitozokigoxirovoz.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fbbe24c41cd5f1035db05b963e654a21/57981578939.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d498ea842---51766349836.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/963d40968281d421b9836e2ff283907c/41130983296.pdf
    • http://aire-limpio.com/img/editor/file/35631057595.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/44jh2t5bcuv0bk061elelsssic/gajolikurinopatabixijew.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/350fa1323c3dae7365049efa8ff924e9/91336974100.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/695f3553ad728e11bd79f4612691eca9/wibivesipuvebumubusi.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160897fb96eb15---repobetukabujuxasimurisur.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4ti50elfvjvj8gs6lvap5ivddd/soletigokobatajin.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/0id6dsveeqv81c3ck5k6bi6qdb/19750075864.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaec.bin
e84d3b69d7b2f203836325dd20f04a626f82b489c125d2e9edb3ec057f8e0a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 17220 bytes
font_01_sfnt_off000117c3.bin
e63d5103f2e7f6cff7c51fc1883547c6381e3b0488502a13a7749ccf49662741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 11168 bytes
font_02_sfnt_off00013188.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13188 16792 bytes
font_03_sfnt_off00014999.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14999 16312 bytes

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