Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce0823d0770559c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-01 11:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9656ecfb922d6b4fff1991f479380e3 SHA-1: 885b7332415e6ee6c2b07d3160babe1dfbd9d2e6 SHA-256: 7ce0823d0770559c24181ab0da6bb1788221e8c5d8ca3e2aea9a27a6f89f9b33
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/19fb85a8766a77ce46f2537732d9883a/penaborogebuziralomo.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aad87e8a898---40623387562.pdfIn PDF document text
    • https://kede.org/userfiles/file/mixamefa.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210605_C1A93F6A4012FDB4.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/99252346957.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210729172930.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160925632b022a---80237904036.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/jugiwuxisapafixega.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e249eb46a8f1bd729ab99f312dd1825b/regifinikemudeziwaxenu.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/630pp46cnsb7f2b9l554lhhdq7/98687595071.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8f44b37d39706d9de7b1dedc42c03e10/74088514491.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/nudabofutevewobaje.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/gifado.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/54543749394.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/lipexagamife.pdfIn PDF document text
    • http://come2menorca.com/images/file/58092975273.pdfIn PDF document text
    • https://andhimazhai.com/images/files/97796296463.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c6563fb0527---jujukamojazusi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/27391265083.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/xiwoviboputoribasabewite.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/vipokejopona.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/92903049817.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/fepimukafofilogikezujekew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tamil+new+song+2020+mp3PDF 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_off0000b7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 15696 bytes
SHA-256: 9a493b7c0265f580176e74c6db9ba8f828c08bf73f78a0f6f91a675e00e4248c
font_02_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 10860 bytes
SHA-256: 9535340d2eacad116fa33acf6b51473c1436b0d94326894a38212e8ee1314f12

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