Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8270d56eccdac66…

MALICIOUS

PDF

80.7 KB Created: 2021-08-09 10:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f80d9270e2690ae510415d4a2fa28549 SHA-1: 1b3baa01e57a576dc266d22ab8e48c7ce4882b10 SHA-256: b8270d56eccdac662387fbea3fee6912950c50e49bcdad35393fb29ace87a042
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the presence of many external URIs indicates a strong intent to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=how+to+turn+off+airbag+light+ford+escape PDF link annotation
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf4bb51c27a35e4a94637cf604987625/tanaxajetelipup.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/67c873d9fee5db4138b9e10b7faf772b/butebosaserubunakus.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/861136820.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31bbb7a42c---jirulujetaweteperofijira.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e823b4ea9704cbf88c287fc2f0fa0529/pijaxozusavafimudumimufu.pdfIn PDF document text
    • http://davcpundri.com/css/file/wamitapovajiti.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/batutidetofalezizabi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba984787201---23781790906.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/vatutivijopokepeb.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/vefevikisugotuzinuxuf.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f876aa973---31761777170.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xawulejekobika.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/3665291821.pdfIn PDF document text
    • http://446888.top/userfiles/file/budowazitefatuzaxewumatil.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/labonafofomulelonabinize.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/10250768435.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/fezoropufopijo.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/zogakam.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/61690322671.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160987bf1d5bc8---47412568336.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3e7f60929---7960459035.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/baguwot.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2aae0e1a---71297215649.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_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 11216 bytes
SHA-256: 9b5b14b9d723f6bb2e160493e5decac95c6f95c5ea1708d75bbbd16bcad7da34
font_01_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 16364 bytes
SHA-256: 39acf5ae07cd13a6a9dbb885d200caf27d0baaa09a1f671549522f6c522cb52c
font_02_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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