Malicious PDF — malware analysis report

Static analysis result for SHA-256 981f84d8299c41da…

MALICIOUS

PDF

88.0 KB Created: 2021-09-02 05:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba1222553d8b3cb51434cb5bbae3d16b SHA-1: dc4a7eb56dd69f3338e07e46de28ef1724e4d6f3 SHA-256: 981f84d8299c41da5d3efd71d3943772f961ab10fbe278b7cb561a6f9e951233
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://butterfly-propertymanagement.com/userfiles/file/57557282286.pdf In PDF document text
    • http://makassitools.com/userfiles/file///12673575823.pdfIn PDF document text
    • http://ccshecea.org/upload/files/87921201579.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/69324076973.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/belonu.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202108300045416799.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c21adb9edca---50336870200.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb261afa19---69960821392.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ee6b212be---buwawusekaliro.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/xorawosaki.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/88733952948.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a33854029---rinixuze.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/99669680631.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb55275b47---50835472629.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202185017101263.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/39260541694.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/88104005734.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/76244257203.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/warazepamenenowida.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/zunisirumidukuriwux.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9856698b104062bdbacd2c4e13f9e778/72929244900.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/sexinizumoditobo.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/pedugefumamadaziba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pirate+kings+free+giftsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f061.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF061 18056 bytes
SHA-256: 6b4c631b6b4e33163478646c23c2ca55edf17f9adf6ce9029f4d40fc9ed08e6c
font_00_sfnt_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 10316 bytes
SHA-256: 61e4e0a91b6c52ba631bb3f4d45eb0bc000f358f1dd4192328ba1de53207093a
font_02_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 17420 bytes
SHA-256: bb0740feb54b46d25d27c20c1d779bf1bef3d2c18ecd79effa6e7ff0cf5806b8
font_03_sfnt_off000139f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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