Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab1e580a24f705e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 00:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60974fc3102d4fd486f3357394edc0fb SHA-1: b7231f3756da9cb8285c2bda336bd84e64543b5e SHA-256: 6ab1e580a24f705e1795833c4934c391420d4f20c83a2f783dc4cad773c18195
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV both flagged this file as malicious, with ClamAV specifically identifying it as a phishing trojan. The primary function appears to be redirecting users to potentially malicious sites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://amirafouad.com/uploaded_files/file/sosekilebikiwixes.pdf In PDF document text
    • http://kasargod.net/uploads/file/tegovozebisizugupemebaze.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ada0625c633780da13bfb01ef2d7a8e1/pamuvilevarile.pdfIn PDF document text
    • http://matras-devison.com/upload/file/jadezukakidufutinibob.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/kifikokejaxefug.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/33277606449.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a35f11d5---40707578733.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a442e3e4f98aa67c6d44115cbe8e5568/sokokakibamitulug.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/garuwovekuxisobimojorez.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099314ae7f26---66985296144.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abf23e6f6d8---26054513720.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/delesekoxes.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074990faa493---dirixefukuvuxagoxogas.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8b7d5f4aa---puvoxoragowufitumulozap.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/mezefifagojezot.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/sozewoporog.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5081c2a4c---70233543934.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59afe09781---36987724941.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1611a55350e977---79404709133.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927943e66fb---garavogatewubaz.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f8b437a109c23df0398fcdcbbbae262f/8786378728.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/bukogukawibaworuvidejepan.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/69716040032.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/botula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+can+i+rearrange+pdf+pagesPDF 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_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 10728 bytes
SHA-256: ba4d3e8256d0ff59e7cc172be6111be642100eea0a0268cf960e887a80f9a40a
font_01_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 17408 bytes
SHA-256: b1d12b388431ec089ff5082e15e977dd16c6f03550d235f79c8c1acedaa6dcfb
font_02_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1