Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3de0978c234c45f…

MALICIOUS

PDF

78.1 KB Created: 2021-09-26 14:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5e8d15b625f4b31e1bd7fccfc79a2d02 SHA-1: 99d2136547e4b55dc96e23b501c442c2b467a530 SHA-256: e3de0978c234c45f8766907ff7353d7478f338c6ffffbd784036cbe963e6f3a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely intended to lure users into phishing scams or malware downloads. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=jedi+starfighter+codes PDF link annotation
    • http://chukguwang.com/files/fckeditor/file/92806273699.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/87729702715.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161384050dcbcf---xorazebegeniwopodubilude.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/61722296446.pdfIn PDF document text
    • https://beautydent.hu/editor_up/lusit.pdfIn PDF document text
    • http://turatabor.hu/media/4232775453.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fccp1nd3gq9pc7tvg1a82bfa91/27125951052.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/rijenizemuxure.pdfIn PDF document text
    • http://www.bash.cl/media/file/96800529037.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7ac6oiukk9vrj5ubci03oikfg9/wobano.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/88742458550.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/pizigibovulawa.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/64948249097.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/17444735731.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/mutabetixeduxasojakidexim.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/bafabapa.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/wizisekibozezasatinal.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/97463737853.pdfIn PDF document text
    • http://alltechsro.cz/files/69493654059.pdfIn PDF document text
    • https://thepainter.asia/upload/files/95321832273.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5d295308864a43a9d0edbc84df80dc1d/xodamuju.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/66760743260.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/milagepabifojodam.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 18412 bytes
SHA-256: 942f09b169a2fccf19b7f21103a3f51f41328ba1e5630a10f0a004a31d9a526c
font_01_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 10596 bytes
SHA-256: 54a1a445e29749b562a596c7eaad2be17f809f89f734136a3c8eb33c54fe93be
font_03_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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