Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd451e922e2cea3…

MALICIOUS

PDF

93.6 KB Created: 2021-07-04 07:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01764d6e20283433a9bff77b5fe6b85e SHA-1: 56daed661f1a27bd4c02094dc2c32ba643a9370b SHA-256: 8dd451e922e2cea37f269967c699df61d594e4a9dc96c841527bcd07db617d9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c905f081dec---wulizikorisobaw.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/gewogutegezajisogowev.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210621145658.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/nhmtqrkdebbbifrrm7brhfml0u/33887958659.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/68d117bbec86493b03a10922a205ccff/todopowopida.pdf
    • http://bannhuaduong.net/upload/files/xafuzaxogabodowoseme.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c77fbbb3354---54658118905.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b006ce39185---17685335767.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/971e6249b91bf61a403f95bc054c9968/jaxibokonekovixitupaluja.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a7e5997c---tanevogazobawofegaxijojad.pdf
    • https://namratalakhotia.com/userfiles/files/93982710588.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce66bd9deb5---62246058909.pdf
    • https://schmitz.cz/res/file/80008658487.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e8ab8f6f59c5e1e3d7d80e6997ed37e7/81048373347.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6df5565ce29a2e6826cf46a0727cedab/41691536404.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/d407b45e571a37f8ec3d325a2ebf3a39/42239811355.pdf
    • https://augsburger-dartliga.de/uploads/file/sevaxoxa.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/b2982a7cd3a005d54357a647a693ad50/16007967285.pdf
    • https://allegypttours.net/userfiles/files/64726545810.pdf
    • http://seabeachthailand.com/UserFiles/file/42645595979.pdf
    • https://bamfieldrental.com/userfiles/file/zusowoxafasawopena.pdf
    • http://toonesk.com/upload/32042314659.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/105f519dcc4a87853badeaca562a801b/kogarobobofadirofomiwu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=henry+rollins+iron+quote
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c1a.bin
8821bc5f4bc4fdde070efd4823bd3606465137c0efae470cc0c75baef90f2385
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 17812 bytes
font_01_sfnt_off00013a1e.bin
2be363e0e3cb2b07e8416fdb04eacc21dccb6b48ca731d4a53f7500a32cf9230
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1E 10292 bytes
font_02_sfnt_off00015167.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15167 16792 bytes