Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d541ba73c92c70c…

MALICIOUS

PDF

99.1 KB Created: 2021-07-26 12:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 939c4d4d752f4277b3a71ffa73830f45 SHA-1: c7ad702d6543d45fa181caeda46f3e3e5e47f046 SHA-256: 9d541ba73c92c70c766238f9f61a6c5ef465b30255007a30c885e9e6aa0f2da9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute malicious content or phish users. The presence of numerous distinct hosts and URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/f35tsfb7ilhc9lms31rcl4kfva/80122699811.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e20dea3c5ef6fe45752a9d176345d897/38267222468.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/72430750772.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/50667752541.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/5cd3875d861f6e29272490400b60012d/pejudolo.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/vuxufofalilagij.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608536f8ae39d---69343927809.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/rosisujanirewiru.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7alh4qpbmsj6favs1218sjbqmt/66798276961.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/bf05fcbe2b1f866adb4589dbc9317cf7/wogas.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/nojovug.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/e8b0a519b358f79e4439d66bed1e4475/76902283719.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6ttv246tgvuknig9moor3sp9d3/38131744306.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210601_034300.pdfIn PDF document text
    • http://bdcomunicazione.it/file/jojuwas.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fac18b51d---kuxizojamutovot.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d00346f83---suvinuzi.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bfdab148069d8de5ea87cca858dcb49/8898432542.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/wakowumopovolefuroligo.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/28202185781.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab658009fce---590505863.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7a58ffae---87256370221.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e27e572f7---67999915393.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/geluzojuzopinibaruba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=la+casa+de+bernarda+alba+resumen+por+actos+pdfPDF 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_off00011db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 10888 bytes
SHA-256: cbac65a093164f55b231e32893a10f75bf79a2f2764f83c2cbebca8f561b771b
font_01_sfnt_off000136a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A6 17984 bytes
SHA-256: f077691c652587406ff28d91247de18006d2e89db0386b06a716715fef040647
font_02_sfnt_off00016423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1