Malicious PDF — malware analysis report

Static analysis result for SHA-256 8751a243e28a63e3…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 12:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 069fdcf74d8b1be33b801c78bd2ed56c SHA-1: 629959c3c4ae7101a0aebd09ab6e6af7ab97314a SHA-256: 8751a243e28a63e35aefe9ed221d130d286fc3701586f99650371be6cbbf554c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of external URIs and link farm heuristics indicates a high likelihood of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=nba+2k20+mobile+redeem+codes PDF link annotation
    • http://amongelite.com/ci/userfiles/files/kudawitenexukapuwanu.pdfIn PDF document text
    • http://360global.ca/userfiles/file/lixoduponuso.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/66143607d35c32d122e35040fa1b2c8e/49553237646.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/73070936971.pdfIn PDF document text
    • http://vuason.vn/upload/files/tomidorenarufu.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/9641257630.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/58618775011.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/96829512148.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/javarodasedazulafaxup.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/41426596619.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/36391110623.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/sixokeladanunajuxanewe.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/22336327039.pdfIn PDF document text
    • https://tekartltd.com/upload/files/82021851258.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/vatidape.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/42377851038.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/50120831100.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/jagojelejagakilige.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614afaff5bdd5---pijevilenopamuzujigato.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/66885958781.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/83447910160.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/339d9r631pv6ffv2e1r7f3ltf5/73118615404.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/defiz.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/33729489569.pdfIn PDF document text
    • http://bptramptour.pl/files/file/depegujafezok.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_off0000b331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB331 10780 bytes
SHA-256: e84cf8cb5d690042a84a4fe863eb89f027d521dbc709ded10b01163a81699109
font_01_sfnt_off0000cc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 15980 bytes
SHA-256: ceb05c3443ba8838bd4047339f9a122d8286f999475379ee4506a0e766442f19

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