Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79aa0e96a5c32a8…

MALICIOUS

PDF

84.9 KB Created: 2021-07-16 11:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c41834be9a2ce1147a722fc5018c6a22 SHA-1: 3bf0a8a085fbec9273e77ec1cc6089894ba1eb38 SHA-256: b79aa0e96a5c32a84d4ec7f26484b22ae35f20e65b1a6bf355b1236194eb9fae
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/92404d87f1d8f93b836725ecf0cd1ebb/fovijuvunufadididabifesu.pdf In PDF document text
    • https://yellowstonewildlife.com/17122005003.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ad95cf9a---92993081101.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/99519649217.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e74f6b2cfc8ef0106c44558b3e499894/71206008371.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/26879095258.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/gupadabozevakopuk.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/09ed12bf1bf35ebdde463163c5f7c2a4/novekimuvoxevaneweveri.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/errs9ipkjmkucg5880ojft4ek3/52023396874.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/75210701198.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d0364ed13---85523434322.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/nizutil.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093da39c3f98---sawuk.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b1064a40---botoxotelilololanela.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/85284755960.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/62229f2a39078604119e161a43413d54/6140042667.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/77742670557.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/kewavagoloxux.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/46179598655.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/soturonuveledujonudo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076da272f4ec---muwefovituziribomobug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=5+points+of+architecture+by+le+corbusierPDF 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_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 10968 bytes
SHA-256: c66a5402ca63e0ca05fa8cfff2cbbb18b681a1d086d139458781edbc0b1f4750
font_02_sfnt_off00011857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11857 17276 bytes
SHA-256: 925b8c7f9a1b8517c5b43ac63a135723e16124f4f7106233538cb09ef6709039

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