Malicious PDF — malware analysis report

Static analysis result for SHA-256 08be94fbb90fb850…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 20:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b8252868971667215bab6eda0baf5be3 SHA-1: fd098db0f2ded0207d843ab1d5531690c977b65d SHA-256: 08be94fbb90fb850ff6e0fad8d61d3422f8bcbaf8fbf935eff994c90183b96f2
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://millionsdiscount.com/mo_images/files/17392214998.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7a888b97---sawugetotaverarozuvup.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/30214041171.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615343ce30df2---divamitorizilefo.pdfIn PDF document text
    • http://agrion.org/upload/fichier/rujizadepebamibolixenobur.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tquojshdsuabfirvp5814o8a9g/zonomapexamamokepavisoz.pdfIn PDF document text
    • https://thepainter.asia/upload/files/843599123.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/48151468978.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/wepiwuxagob.pdfIn PDF document text
    • http://cib.lin1.ca/phpsites/vertical_living/uploads/file/gizoxofasojeroxatiwazoma.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/27605947114.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/81714758663.pdfIn PDF document text
    • http://pi-consulting.ch/download/nepuzaxuzuj.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/jewijolilejuzodirujo.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/sunugitibalenutesogade.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/rimedodaradurexorawasobox.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/pawuvawolugepiworekagem.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/tezefe.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c110c56d67---zokoxuka.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/o7k40an7cn62k3lekb3h2jjroe/zatugazesetene.pdfIn PDF document text
    • http://zgic.ru/!upload/files/50241030682.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/rozimetejab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=happy+birthday+sms+for+brother+in+lawPDF link annotation
    • https://bep.semmelweis.hu/userfiles/file/ginunufupalenegikuregel.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_off0000af3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3A 15280 bytes
SHA-256: c0448dd2da7915344f4e51ea0c9fe25b0dec5ee6060e628f12bbbb9e972bbb5f
font_01_sfnt_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 11096 bytes
SHA-256: bf8c82ba6f6911738f16c73146e73091b4ae212127bbcada7778eb40df84d8c8
font_02_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1