Malicious PDF — malware analysis report

Static analysis result for SHA-256 920d8f8efdf3dfb1…

MALICIOUS

PDF

90.2 KB Created: 2021-09-03 11:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f7681e1a2af96b5873b9fa93c4c85ff SHA-1: 78afc69e7b37241b0fc03cd0aa1e255fce41cefb SHA-256: 920d8f8efdf3dfb187264682c9867478b5d9b982e24e80534ddee3a39edc7d5e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://frezerovka.by/images/fxeditor/file/6614133072.pdf In PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/vhcmnbvenkcaobs25j9gbq61sp/kedelubafi.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad628895c1---fugigopamaruni.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/bugelowut.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/at085ru57tjnj9vpdv9dq2ro7d/vimibasanesagilosupulom.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/32928823921.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/dovasutewufen.pdfIn PDF document text
    • http://xycrusher.com/d/files/zuxibotumawejeromozibul.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/daaa81135f3de9c3d0d10d24d68f0bff/22995936580.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/gerewene.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608703d52d127---lununubimodojogad.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/85290794005.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/24680a2cdc39ce2eddab0b41cd15e2be/sovefowine.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/vumolelararipipak.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849d28f2443---gazarodunirarotesaritiw.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5de381ff5---goberigako.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/22207853265.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/89312877432.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/23789579121.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/pilera.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/molagitewokorevufusive.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/18305742400.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072aaa259eb0---nivemuxanuzuxagopemi.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/lakasawobujefir.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f1ff5785945209de3d2b328beacea221/sibotugikevozuj.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/saruvanedeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bipolar+disorder+types+pdfPDF 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_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001149c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 10552 bytes
SHA-256: 667ad599abc41f8e705ad0771927e1281038d2400e02bc7885db047a36aa3736
font_02_sfnt_off00012cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD1 17892 bytes
SHA-256: 8969302aff0457eba39aeb02ef715328c1363502388c7ba47f8a9e9c0b50ce25

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