Malicious PDF — malware analysis report

Static analysis result for SHA-256 189512ea0797d1ab…

MALICIOUS

PDF

72.5 KB Created: 2021-09-06 14:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25dd5ee2994db7b70bcef9cbe53d58f1 SHA-1: 1676045c1c1a1c59c88c88cd03f8292ab7b18abb SHA-256: 189512ea0797d1abd03ff59e79d4d7910bd1db761c64aec1e970cc2fcf8d6b03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=tn+12+books+pdf PDF link annotation
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/639ffee962930361c008559b75dc779f/nuxowipuvinabitirizaxur.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8d0f38e2b67e92578bf350d559dd7767/foleguwa.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/77210238981.pdfIn PDF document text
    • https://atlantidegattico.it/file/93668865101.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/jobamaguwosuxu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/h1phtpd5fb9opu90ld60q3ium3/juzafepimaxapifo.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/79678395198.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/29342451656.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/vfuukfvn5o6oqe868eovt7194k/24276083927.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b81899cc---janowunoxixenet.pdfIn PDF document text
    • https://stvorki.ru/files/file/76882657112.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/93255736243.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/turofixoxurumexizisuti.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/72223803498.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/58128060807.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4843e43dd8---60512278346.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/13650257523.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/kibixeze.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611225b2389d7---jamorasedomajuniwof.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-8/20210508073659393120.pdfIn PDF document text
    • http://haki.vn/uploads/files/36599608200.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607422d3acd2c---7162640271.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_off0000b6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F4 10228 bytes
SHA-256: 76fcc4ba7f503a86cec596805ba25c21d1ea993642975f024afd2e26e40745fe
font_01_sfnt_off0000cdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDE 18604 bytes
SHA-256: 1e41e498b4134f73c9d2c053f366a21fa7fcace83e1642affe1473f2e892cfae
font_02_sfnt_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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