Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f3bcd54e3d3d52…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 19:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4f2ffee3c2123a6ce5d05c5f9ae2637 SHA-1: 832d8c839853cbdc6d69201967d484596c5163ca SHA-256: a0f3bcd54e3d3d52e3288ece9c2eaeed7878c67780b0debd0d0c2aa7480a6196
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms suggests an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kolesnikov.pro/ckfinder/userfiles/files/tunitun.pdf In PDF document text
    • http://saringkarnwood.com/UserFiles/file/45939862153.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/wobozobiwosexu.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/52889892517.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/xevonisemen.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/xajufowabitamidimejujiv.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/vojikarafebisufiwevadew.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///mafudarawame.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/36746314218.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/10385350762.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/letufu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/850feb4b2337dba19272118fd498979f/marexupi.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/96614471230.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/86451397670.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/99947375106.pdfIn PDF document text
    • http://partnercable.hu/files/wozuvat.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/74449586816.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5c9a2b26f16e94d5c4eec87211ada1c7/29163466670.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/54368505340.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/salabiwifekuzele.pdfIn PDF document text
    • https://clickbox.ro/images/file/7248716043.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/80829376381.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ut0f1aj7fhkvvdh48pc7msibk1/peramujamafulusovu.pdfIn PDF document text
    • http://synphabase.ch/upload/file/47550778349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sound+recorder+download+apkPDF 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_off0000d0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C7 10500 bytes
SHA-256: faa8d417a7533b6b1bf571bfe78d7870b8d65d2d430724da85b12b8827f1eec3
font_02_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 21136 bytes
SHA-256: 2fce41d25d8956d1297f53ad0efbd290068665b3f67ad8c9c20d931b71fa16f7