Malicious PDF — malware analysis report

Static analysis result for SHA-256 517e6ef2cb9bac0f…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 01:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b49cc48abba56bdf9e60fe0f98b4bd67 SHA-1: 4f76e918a597c3813624daba610cd547fd615531 SHA-256: 517e6ef2cb9bac0f53e504a04a100801bf92721af8ab05eed84f77de58e2c9a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=free+memory+on+android PDF link annotation
    • https://enerjimakine.com/tsrm1/img/userfiles/file/11285819352.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/sizejusalatubejoxefewiliv.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/rukakibipezofefowogadoxib.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/it4s037qgmvr8sr9gco391f7lt/20184721846.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/niburobuzagujatagutezu.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/32178525862.pdfIn PDF document text
    • http://salespate.com/userfiles/file/27954943103.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/797ba607de74d1b27b69fce9c08d3c0d/20261623612.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/9719076519.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75cfe37cd---46386402125.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sibalatadipit.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/nasivowixurigada.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/3121095088.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/tajoxa.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/93281450191.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/8097040460.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/vedoremisesoxisuvum.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/buraxekipuxob.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/15730992071.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/sarolabezuxevotila.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/90333163196.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_off0000bf39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF39 10188 bytes
SHA-256: de11699f499e27daf4f2db4d35860114ca4784d835f28d50ebb19e06f8d57c40
font_01_sfnt_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 16620 bytes
SHA-256: 778bc77f0a3f6ba6f34432e7637336d0f4d1daa2369c29482b54494817629470