Malicious PDF — malware analysis report

Static analysis result for SHA-256 4008d889c85057e7…

MALICIOUS

PDF

84.8 KB Created: 2021-07-31 01:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4540a3e5ad5ea93cc45471d67cba1d9e SHA-1: 41e27ecb9d6211f655b116548e97b21daee28102 SHA-256: 4008d889c85057e7b4a2c86813613ab3faa9a2529fe748307b3afe1b1993e5b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=bangla+film+audio+song+download+ringtone PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d01ed72d---goperagotazakakajojuvesin.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/kabipalibaxowoxa.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/90422248775.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d085f4d1e4---84358596021.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/64089412707.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/66b04121cfe2456c5685a576dc2e458f/19844483112.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b81c525d294---46079786662.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/35056732939.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5gp1haemckq1t18vu1olskc4p7/nonelopawujamigiluwele.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772fc01d38e---14257292753.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/30978871333.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fa3c8e44---24544832972.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ace9835cb8972bed8479ad2eef3373cf/wafujotipirelukadi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b515e8994d---puwadinokaler.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/68599247044.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c38eb53b---40376790907.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f874772b57b---taxesaladasiwo.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/61536844353.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16077d0fab29b9---toxomukur.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aa6624f00---jutapajoz.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/soloke.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/31070668931.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/i4ebkrembb1lnoboag4t25cbfq/robalawujalunakapanaza.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bec1f4ccc07---78027474687.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_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 16572 bytes
SHA-256: aec0da296109dda5200541e1b2066515a5dbb5033aa550f92b767ba2292c286a
font_01_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 10936 bytes
SHA-256: 85cbef29745a295382d9800617aa8fb919c7945e1cfd726e76a8f3f190ff4891

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