Malicious PDF — malware analysis report

Static analysis result for SHA-256 620f1386b32fc780…

MALICIOUS

PDF

78.5 KB Created: 2021-09-10 10:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 943cc7c8a47dc6a778e571b5c5c42852 SHA-1: 580485262cbf4e701c4cee611a0171241e798c03 SHA-256: 620f1386b32fc7802b803e8cdca66462a25a2d89aeaca47a2cc85a93ef433582
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=handmaiden+watch+online+eng+sub PDF link annotation
    • https://handientu.vn/userfiles/file/92662204743.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/revexulaga.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/sukinawu.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/tarutugegavatabobisuwusow.pdfIn PDF document text
    • http://ktcz.eu/files/files/12824088384.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/91152543792.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/63666476859.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/biferena.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/66736464909.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/gixatufujur.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/xilopepujujaxevafukevus.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367ef97847d---28344065827.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/86305329874.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210910/files/20210910051118.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/56041812646.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161368b52b96f5---wezevijigugazanegume.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136016567811---32642775283.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba0a22b66---12910946711.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/jozeraburevojujalujepes.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/pupibagunifalomedafu.pdfIn PDF document text
    • http://chinalabware.ru/d/files/xipedevefasekimidokobu.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/pezumosugobekidiger.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/verezadaperevuruteluguti.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/13602180724.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/guvaroraxonasok.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_off0000cca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 11032 bytes
SHA-256: 1e97a1a112614390bec5b6a842f7deb78f534a9801823edf394316377b76efd1
font_02_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 17952 bytes
SHA-256: df48911fb99f1f08ecbe18cb3404d2dfa147b71e55e5dd9b61e3fd52630ff14e

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