Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f42aaded8d7141…

MALICIOUS

PDF

88.7 KB Created: 2021-07-14 00:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68b8e9cd7e4071bca819cca0dd9d3570 SHA-1: c64d42da83970dcd928123de26bfe5c940fa4af3 SHA-256: 57f42aaded8d7141f673f18db6874d7dc09e21b4bd5e8ec3c85635334c700e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://garglob.ru/uplcv?utm_term=outlook+express+for+windows+10+free+download PDF link annotation
    • https://mmagame.com/userfiles/file/68380122790.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/87127723534.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/62348500846.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624713895.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/talen.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/313c7c1958c0291c5ec0ebfeead7b263/wikazidoxuweravekojidota.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b2f9562e1dd1ab3bac2eaf312f24f627/95326126880.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/32dd0b908c2c592ca9748240d6a8d345/64097141410.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/gulolipolezibu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/hb7770qo0hkam6nvkj5v9h489a/49773555468.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/2e1d0cf7d27c0e9eb679ebc5b609b318/suxenazuluberivamu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c3cddec00---jafewelexeburowikojejisev.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tonule.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/39115798700.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/4061257253.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/56178006670.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/499a0b1ca65c73ab04e0f56a1dbefe88/zigifubanejeligasawa.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160baba6e16ee8---84352075907.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16081b79bb8725---lodulebu.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/10db8629c83f0465d119fc1aee5cdbe5/87199274775.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/25634525064.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a098f3e7ff---fepabopawefudiradifaratez.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/30954135581.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_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 16876 bytes
SHA-256: 6c91ca70a097e068b9669d77043b3bbc308b68c2bde253bcd21b5f8364dbf108
font_01_sfnt_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 11068 bytes
SHA-256: 303e594073ea5f1f1cf9580eb77662994149798fbb878178a86aa14ed33a20d4
font_02_sfnt_off00013d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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