Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a88b7044cf1ca58…

MALICIOUS

PDF

85.6 KB Created: 2021-07-03 11:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76b7c2134a7be4b99826f97b03d49e05 SHA-1: 878de6415cc137d833ae00a50a40d0249dc3ebef SHA-256: 0a88b7044cf1ca58f6202b6b1f472a8aaaad9a98b2265e7848745502a18a0bc1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/piqq7o6kc45fmths5922ph0fl5/22913757256.pdf In PDF document text
    • https://b2cexpressdemo.com/userfiles/file/siwodubakifabimovezumav.pdfIn PDF document text
    • http://moristas.com/userfiles/files/mofabivinavizajawerox.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/31339377565.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/82542032964.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c444404158---33994008960.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/t3qbabvedjv5j1stgd6ko407u7/49842175993.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fbc405f708b83dc24f03373ae8c01cc8/ronarop.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acae85c98de---22267291566.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/nubugekidus.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/620933cbf9721ce4ba7622bac9b6cc24/15041287058.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/64r7cq7tl178jmb0tkdg4qfp32/mositadalinirewazototinav.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848b965b22b---19449576989.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7f2883dd2be2d28532db99b37057575f/lonelusujuvipigomewepo.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3b409388b08504f328fcb0ac77953d5d/14595455558.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/dowasovuropogasatofewivev.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6eae7c6fa9---kisajizib.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/46404199930.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/jalukasiwujajotavudepo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a52c993f6b---mapobelasisudukimaxazeno.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/2374818610.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/repizowubikariwakotaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=examples+of+internal+energyPDF 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_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 17048 bytes
SHA-256: 1f558b8e286f456a9e694c4638f7c54bdbdd744d40314c4c249fdce30f5f9e46
font_01_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 10900 bytes
SHA-256: cb6c95ff48bb6c763a50e02df84f71f86fe4280c52a0ab0fe0c5aa7ababfae2e
font_02_sfnt_off0001317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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