Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3da272ba79b522…

MALICIOUS

PDF

85.6 KB Created: 2021-10-04 19:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8060674ac5f272087861f946a62cad4 SHA-1: 7be417b33befe7f7bb3c7ff9fbae1ee57508ac7e SHA-256: 3c3da272ba79b5225a81f25812b478c505176a5d38788b4f9a9b73158878b126
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The presence of external URIs and link farm characteristics points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://infrive.ru/uplcv?utm_term=which+epithelium+has+pillar+like+cells PDF link annotation
    • http://araratmebel.ru/img/file/86381461592.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/75496849727.pdfIn PDF document text
    • http://moristas.com/userfiles/files/wuxiwakosovaligilaboze.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/34357299856.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/xidevatebikobu.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/xuguxixixutemujekininax.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/94869628321.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/39485655935.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/oxikodero.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/41874915465.pdfIn PDF document text
    • https://orrizon.ru/images/file/85222110766.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614924327c5e9---gogufat.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/rezewedofojirusomogedigiw.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/o7sl8tuho2qa18qjj148r4eke1/rixepipepi.pdfIn PDF document text
    • http://premo.at/userfiles/file/lugujunoz.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/52888474380.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/xemazenogulesat.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/xarisuxafemefiz.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161522e75edae4---piguka.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/bunanivipodekekinisesegon.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/begefexize.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20211004113603.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/lixenatepip.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/dafulafezajivuwe.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/45567105249.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/narosavaxekizovebek.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/18213993382.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_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 10600 bytes
SHA-256: a699c88cb9d62bd393b3c6e88e9ea7040d52be96369a7439d1680e73da698175
font_01_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 18804 bytes
SHA-256: 47ab6bdeec908f130b9bfcef01c36d3b4676205f637fcad4ad45d19d82b5b709
font_02_sfnt_off000130df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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