Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc571647465da506…

MALICIOUS

PDF

92.4 KB Created: 2021-08-10 23:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30ab7e798e32f2d13ddbeb5b28b75a6a SHA-1: 35b8c47ef4f9a85de05f1fe78e1be71d4cde49ea SHA-256: bc571647465da5065bcd9039b6cc9eacd06017bffca614a7929b08c1f8ecfdf3
176 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to various PDF files hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or engage in phishing. The heuristic 'SE_ENABLE_LURE' indicates the document likely instructs the user to enable macros or editing, a common tactic for malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://argol-editions.fr/userfiles/file/rawuzeta.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bfec872995784b454dd1b3289eac5f45/63424560019.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b143e1d0c1f893a3fc1bddfec38ed124/tirolomowiposupoto.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/jonikizu.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/17759629299.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/oj2k28hca1ffam0r30r5quebk1/dizokanukadezekudub.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/061751123767.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e582a5ec800911470a5a6ffa3573c17b/81674068248.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/05034b7556fde17778bc3f8c4a88bc58/52564749737.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/bafewomunafupo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/86262364288.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/rfn7al8k5us7epi4dkjpkm73d7/bukaluxuvutuxofadiza.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/kulitifip.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/0a16bd021d5377090373e8f6491033f1/17127941110.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e493c58f882---39836078206.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ecb048dc18d67c6a14617eb070a0ca5d/nobovonubep.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/8215b4a587f26bc3d57533603ee2b3e6/72775899783.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/80622053090.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/24cad65ec3a53ecacf0eb45357c2b205/gigukiwor.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f467efa1ee6---jamanatudinaruwigunu.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/xezususorofu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bakexidizuxukozawave.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/24702121334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+convert+a+pdf+file+to+a+word+documentPDF 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_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 17696 bytes
SHA-256: b39c178a49fc6a526766734d0e60c150947aeecefb03fa53259249b6049746d6
font_01_sfnt_off000131b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CB 10856 bytes
SHA-256: 0a625a82434187116a00e1e8fc466d88f1c25bb4bc7b0706e74f23dbef88b105