Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4bc800efe8e66f…

MALICIOUS

PDF

89.9 KB Created: 2021-07-05 05:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 227d7d371fdb23eafe29706aeeccfd70 SHA-1: d567bc08e2caa84aec8394a05bb1e5be72d4f83b SHA-256: 6b4bc800efe8e66fe024138ad6f635ffc511e813acb148c89f114c6d3a27e4f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 a large number of embedded URLs, many pointing to compromised WordPress sites, and one specifically to 'smidgel.ru' with a 'utm_term' parameter suggesting a phishing lure. The document body is heavily obfuscated and unreadable, but the presence of numerous links indicates an attempt to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=adult+live+streaming+apk PDF link annotation
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3486a0617---valipobegido.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hpgj7a59qmdu0us555ifqniio2/ladujeradujakijibo.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/mexoribut.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/xejofarune.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a404f6b5f33---fofideruruzama.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/fupubumuxuxofilozevowik.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c307ee10---49139872788.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/5920487169.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ce0708bb1dbe00d88256007ae6795cdb/zasetovimiliwuxosego.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/cedfb4b5088e03bbb21a03d5d7b227ca/pugemuruburabemulobaninut.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dosurogajuvokega.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5962097b6---73824881555.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3ra13flvushvi2m5fs8sm8b0ie/95499265015.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4052387025---48470060375.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f5f7d16a205480c03ef453665eb27637/73393245270.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/99887e9273ae2946703cb134bcd8325a/60838526525.pdfIn PDF document text
    • https://ancoraeducacion.com/images/79095442789.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac922a2cf32---66292276154.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c889cc5ccef---79061250377.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e8e93353f13e64f6736e6b455cc30027/88666692516.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3820136b30bf2f5bf661972694bafcd9/66334989305.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c75297cf8ecca64236d6a5b38071bcce/93022104913.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/vezaralakagogaterixi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2497068978---3425148246.pdfIn PDF document text
    • 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_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 10856 bytes
SHA-256: e111ae296d24fb566c36536e399a5bbc160360ca370a055ed32751baa1be38af
font_01_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 17284 bytes
SHA-256: 5afcaedf33e5be5ebd0a0ed04d84b0e213013a81a348e10e109e9e8caf391df8
font_02_sfnt_off00014286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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