Malicious PDF — malware analysis report

Static analysis result for SHA-256 a291fdbfaacc1114…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 07:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24671a222c62d4ca9c096904dfc2b6b1 SHA-1: 37462026a5157f29e5cff3654e0e2928dc8c2865 SHA-256: a291fdbfaacc11148fa5ef02739de2c88c39fa3474ac0b98230d57d9af93a5e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress uploads. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=how+to+get+more+internal+memory+on+android+phone PDF link annotation
    • http://abc-tel.ru/data/File/vimegobulobabovijas.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/wudoxekevober.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/duborafofogarida.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/13996120731.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/kenuxutet.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4990d621fec46d4dedc5b579f72d1c52/95820480.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8m7nnodh6sojgojlemun1jdgk9/46891420113.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/fivum.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/xuzagepazupi.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/vitakepajumoka.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/60546854223.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/dumimejifutilul.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/nirusotila.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/lezafaxavuzo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/xenoxaposut.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/juxabunesevugero.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/kozisapedox.pdfIn PDF document text
    • http://koala-al.com/d/files/33052344863.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/nejozazagimudel.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/85893177486.pdfIn PDF document text
    • http://bankerz.in/qpic/files/kapewinupiboto.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161307ef31f2e5---jelijonevirikada.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f92d5f92c---giruxif.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_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 17796 bytes
SHA-256: 39e8b320176df18dc670d2eceeac6c0d305dfcef1d55e8f0512f38d21022b6cb
font_01_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F17 10864 bytes
SHA-256: 48cf252ad5b806dee681aad50b1d438709dc62684212fd8c788a5328ec059829

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