Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5aafee504cecec…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 07:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd7898d2c0f663a66d59c77fa5b8d9da SHA-1: 8cd00555d490b0b0f2c170647f48d209c8a98e41 SHA-256: bd5aafee504cececb2d2af8dc4498a3797feaebdce8060e008cbff49ccda6e0f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting. These links likely serve to lure users to phishing sites or download further malicious content.

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 http://littlepearlspublishing.in/data/eimages/file/gefopumaf.pdf In PDF document text
    • http://iphysiology.ru/upload/43287228542.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc2ae1d92---mujelimudanudoxif.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/18525360549.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6umrdfusbf42kivtkh8tu42hvp/45495753608.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608825890834b---wozur.pdfIn PDF document text
    • http://sql110.com/pic/fidexud.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/83137568888.pdfIn PDF document text
    • http://chamdure.com/DATA/files/raxisagapemateliz.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4c958c67d5877ff18d19a1bb68dc055/56740319310.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/depolijulojafotewowerida.pdfIn PDF document text
    • http://indel.sk/userfiles/file/gotifulob.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f3f83b02d1f006034ab4eb1b00ec41f1/73206843804.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8483d0ba4---91180401245.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/96765534012.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210508184551.pdfIn PDF document text
    • https://nadamasristorante.it/file/32915829084.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4c3f5998af71465a4c8da81e4b33d14c/56057894803.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/49147175975.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2hubbnt8brsp73tu0iehrqcgif/mudulovabopizepuzepo.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/52330101973.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/64118837710.pdfIn PDF document text
    • https://tdfstore.it/file/gigelufurufamanajefamizuv.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/43080878732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=computer+networking+pdf+tutorialPDF 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_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 10980 bytes
SHA-256: 149041e99df8c0c78ab8b0c0c5ad3c853fd195d7f5f88cc4ee5f8581bf99a09a
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 16908 bytes
SHA-256: 68f2fa83e70704e6b2e1ee2af5a7004d1fe59580ed7f2f4c3e9af9d4c1e9dcd0
font_02_sfnt_off00012262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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