Malicious PDF — malware analysis report

Static analysis result for SHA-256 9326800d2722d612…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 20:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a97ace2da867df1c5c87ee0fa6d2bc4 SHA-1: e017430ce69328ee264fb3f13c50f649e5496ab0 SHA-256: 9326800d2722d6124a6f4bd39dfe603aeef074f8a98b6f8f2e7a601357eca018
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://magnumprint.ru/upload/files/gisadetet.pdf In PDF document text
    • https://norservis.com/files/files/duromedovutotosowabal.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/75371475405.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/23cf03e84642bfaba92afdb8cf9dab40/sofodofukutetemiv.pdfIn PDF document text
    • http://precisao.net/files/files/38670530821.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/letuluxenafofepejosub.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/bakigasigefazubudesajuna.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/papofozizotatevekir.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/318693151.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/vasevuborodokupivanodu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/17616774.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/sejabevarifuxatamanoruv.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/kamuweza.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfa70d8be0---72749799695.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109081229056221.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/6078119223.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/12170886245.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/48391371828.pdfIn PDF document text
    • https://33mobility.net/uploads/files/kuguxap.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/27920960148.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b5aecfb5e---tipenelowosewajavigewusef.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/rawufuwaruduxiximeka.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/wuzatukudajevonawides.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/zosorupag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+blue+download+apkPDF 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_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 18164 bytes
SHA-256: a6ab6c7bc80874c8d25ab01a65bbc6a03bbbafc6ff8ab999aa687fd020650aa3
font_02_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 10512 bytes
SHA-256: 3f377fae12aa49cabc57f7dc422390807dd6a237639ce4c097a28091c8bf8cad

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