Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d8080b7b854484…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 21:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c3ead627daf958bfa3521e7c9a45b153 SHA-1: b6aac03bb4d4f610f3430b747df8f482e20e0473 SHA-256: 41d8080b7b8544847bd891c3ed19a864c1b97d7866e1025c7309119f3ac00677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=charts+and+graphs+worksheets+2nd+grade PDF link annotation
    • http://pospatrans.cz/UserFiles/File/50032557215.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/tevilivovekaruw.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc14a050806---rumowutenesopaguxomekel.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/52699985206.pdfIn PDF document text
    • http://dgjst.com/upfile/file/66539398029.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/bifojogigerikikuwuveta.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/23982797607.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/59fbd352d1f927a70e356bac883ff73c/44458159403.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/30953068032.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/22607094820.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/93138408468.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160886aa669569---54087649463.pdfIn PDF document text
    • http://qca.ch/userfiles/file/siluxilikipalefikeg.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fba9e42acaa---29085891023.pdfIn PDF document text
    • http://strandedtattoo.net/file/wiwojonovofek.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/rufudilamarasikixogadaf.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/37301253633.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/xibefatadetaxemomuza.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d224b803770471d80ad1d2a6e87aecbc/44197706455.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecb283d23---39919439566.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217f926def8---wamugetegeforimazuwamug.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/47529763173.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/texoxesixa.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d481af335---59745561019.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_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 10860 bytes
SHA-256: 063535e15c28e16a4613293ada73ff4fdde8af9b5ce607d5815467d90ff2e06f
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 16632 bytes
SHA-256: 00b735c0e01755cb1f246617e559971eeeeadce73f45dd4144c02196a8f86fbf
font_02_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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