Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b397a5707aab3a2…

MALICIOUS

PDF

77.8 KB Created: 2021-06-14 21:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 059af67bd8a58a1ef8148674d8aa92cc SHA-1: a891b86440e59d19b67253c0f51011cf19db8fba SHA-256: 9b397a5707aab3a22a80df9522f76405f40307e4094248fcf860e60345659035
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=apa+format+for+quotes PDF link annotation
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60007d3724---2107125499.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c476d4e92---timazarumokipitap.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2da613bc6e01b89ddf98c8a455118b8e/mibilozeramodagozijofo.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/84f096fb453ca037c9800433bd06dd16/57802573316.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/86c6e4do3eljfhks1b3td54e87/45563237225.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gexonisekutanogol.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/616a4744996ee389b89f326b1ed05c84/68597306639.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/63563406690.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qs0dadm6hu7knqq977qessqnet/dilotomugikapiduborutu.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/cni4fitog8bqjmtvrhgtpsk309/96847358173.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/bad3dba02529af48b9054b3900ef90f3/tomodikakogomowiwo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f82145d4a7---sasomozetokifixikudegaze.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/91764328605.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/sowutumixepubeb.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/576b574fc7dbd863088e3f644dbf36d6/gulakepifos.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5014c195---fugenodugidamudegere.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9v7d0ce3h5bv6ffh51slib5gcr/sigefokefevowerojal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 5128 bytes
SHA-256: ef2d03f76cb912d3550edec7c21b3d2346fa04e892b5fa03ac976c4f8336c258
font_01_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 2004 bytes
SHA-256: befe86f2e9182c7f8135518b94c1ca1a9c8a9a9a6f5fec12d9bc7402366ce87a
font_02_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 10552 bytes
SHA-256: b3f3c8a1bd7d7de5236482efa86cf2ef8a803a32805ffee7fe3dca47cf1b206d