Malicious PDF — malware analysis report

Static analysis result for SHA-256 81250ace747ac038…

MALICIOUS

PDF

85.1 KB Created: 2021-07-13 05:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c387e33528eed7611ff910e377c7f50 SHA-1: 900543ff2bf92489c93f48df1c59d27588524ded SHA-256: 81250ace747ac03840a26de880e4aee510226899c1e38930399c5a0dc844d743
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02f7c26d5---95174988359.pdf In PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/71550670980.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083337a3e39f---xapabadazulifenisozapajor.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/5312237bd376c9242adadeddc5c6fb99/vonelutaxipadodusinexu.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ko06jdd7vji8ndar8rl48j28bs/pununufigusilagisixaro.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16257753772041733729.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/rawojetafopez.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb73b7d664e---70565641573.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/mutituwazavipesesezam.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/fuximud.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe1ff1214b---rurigunukujoka.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607edad6665a5---58285849288.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb6241df2---jozegegiditowurowa.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/23591395361.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fp6558ii86k7141f5efoh4vj11/reruka.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/dbc7f72d5e7f276e532421b5cd015e5a/dutezefu.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/wosafaf.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/42996547283.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/060c1e066c51171b30ef0a0a78535992/ramolifevapimalat.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/1651811795.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/81026928540.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608898691a4b4---pulipemopuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=antimony+trisulphide+and+potassium+chloratePDF 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_off0000e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 10972 bytes
SHA-256: b8a9ce852dab32a1ef667a064dec8bfc88c2cb033fe5b6582d3bd0eb696d128d
font_02_sfnt_off00011a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 17076 bytes
SHA-256: f0d058c0701f7bc466fe8b5b9ddccf5820109d58677ab0bb3b2c93b9f5e02d47

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