Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24489cf11babffe…

MALICIOUS

PDF

72.7 KB Created: 2021-09-21 22:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 89b41365ed19e724ce75fced0ab3afdf SHA-1: 265fc5f19a23a282d598bd78748d8df832999093 SHA-256: b24489cf11babffe7db4de34c648aa786ed87ca85b046ec8e6041b970ba90c32
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 numerous embedded URLs pointing to potentially compromised or disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/62898efcec26fd68fc9a0b9b9b902eae/rimobaninunutijirar.pdf In PDF document text
    • http://yuli-china.ru/d/files/35935536350.pdfIn PDF document text
    • https://msvadba.ru/files/file/bogidipesowowikarewapuveb.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/58711127039.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/kofusodifetetu.pdfIn PDF document text
    • http://princeverma.in/uploads/files/86990980619.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/26072098108.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/16282553191.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6cd4fc839eed80af9ca27216de813de6/xefagonulomemopuzimaja.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/fejimuzo.pdfIn PDF document text
    • https://pokereshop.cz/data/file/gidarululozu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa1d9a80a---gatalumuzi.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/20156592772.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/74562512688.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/bejajijakukavo.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/gojolefewemuboganetuzezob.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/vuliwetenijedimatodoru.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/soviwunito.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/fanojajuxuni.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/bekipib.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5b75f0979359e8be304b3a16145d5799/lixurotiteguwevezimebodo.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/44818964602.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/rukivup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+would+you+know+if+your+phone+is+hackedPDF 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_off0000bd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD33 11004 bytes
SHA-256: 5336ca7a5c3216bf4e3d6c0c845094ba0ba78d7285c74a6469fe92abc08c39f3
font_01_sfnt_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 15304 bytes
SHA-256: 3e0e25083dec1cdcddc625b2aceeefadd40d044a16d56e587c1755e8fdcdd5c9
font_02_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1