Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb201590dd4df2a…

MALICIOUS

PDF

93.7 KB Created: 2021-08-07 23:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c8d05de0bc41a02c2cb17a93656d1414 SHA-1: 4d3a36d3e4f822229d7ac9c3a3a9148f47488471 SHA-256: 0fb201590dd4df2a075967f01d8360e667529914d4feecd23f4c7381b0b5b9fc
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://krisoc.ru/uplcv?utm_term=paradise+lost+book+1+translation+in+urdu+pdf PDF link annotation
    • http://haiqi-machine.com/d/files/42285871372.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5115cdf2877b1e7836177ecda54839e3/nubajurenunibizixeruje.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/fb8f791a9ad29cfbd451f9eda200a9e0/pajaruji.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091113be9182---nujofexuzetugavuxiriw.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca94253aa---lofoxebo.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/mobalakegitopemuku.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bc3c9b217---43191347408.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/k72srv9dfctqbpqmeqt7cj041f/fuvaladezasidaragijoreb.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/92580655875.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/koxobizerizajarefoxodo.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/27250552271.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/limunabuwujesapi.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/292701bce803101dd0d21371e601141f/vizoriwajijoxidopoge.pdfIn PDF document text
    • https://motacademy.it/file/zikinokuxinopoto.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/mezim.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/sopupas.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/266eb4751a2403232136bf599129c88f/dewumetorikexaki.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/52293881387.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/m7fneph8qulaqth2k323flero3/rifeji.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/liwevikilixoduzujugujim.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/damiw.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/39622385960.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8a352455e---kiseweluzupedavoter.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_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F24 18112 bytes
SHA-256: 133f06486591e1bc92e897c9958bbc99cdaee5504c2459c3277825b373260212
font_02_sfnt_off00014e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4B 10876 bytes
SHA-256: 70984e72fc22646b1532a14d2a5f073aa67a1e2c3daee401d9eb0809bfc5e06e

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