Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08dfb756fd27681…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 00:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca5aa1a937294158d424fae5005169c4 SHA-1: 30ccb943d0d8aacacea0a0345b14a8011f129b61 SHA-256: b08dfb756fd27681a49bd8b306b455979edc2a5fc40e02ccbc0539a8c753f527
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the PDF is part of a multi-stage attack, likely to deliver a payload after bypassing initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=subway+surfers+halloween+hack+download
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7311807d5152634dfaf9306e3133b12a/maxezurexavujove.pdf
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/35797576686.pdf
    • http://lsneotek.com/ckupload/files/3987142859.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161302739aa3b1---dubawoxozezomemowix.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b3441679e6ff4b550d7cb2af595884b2/2436559809.pdf
    • https://cahayaapi1.com/contents/files/dirapipigikew.pdf
    • https://osakaav.com/userfiles/files/43825127244.pdf
    • http://mai-colle.jp/userfiles/file/51064588537.pdf
    • http://studioambienteterritorio.it/userfiles/files/najumedi.pdf
    • https://glearningsolutions.com/userfiles/files/risutusukenojenotu.pdf
    • http://toyotaprius-custom.com/js/upload/files/48937957199.pdf
    • http://officeharbor.com/pdtInfo/kunareku.pdf
    • http://transchem-tech.com/Uploadfiles/files/32803351607.pdf
    • http://lineshare.net/upload/files/20210914082440.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/75694920587.pdf
    • http://rassadaspb.com/new/files/file/25993897268.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/2884353385.pdf
    • http://arablift.net/userfiles/file/sabupokejapagogizokozoz.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/25415691146.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/93795787484.pdf
    • http://ayrh.internet-match.com/upload/files/vetuligabofadakerezanotil.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/86919985159.pdf
    • http://pytextiles.com/userfiles/file/22683031859.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/9572515578.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d03d.bin
9dbdc28ce89cbc502205f61a93e1768c88bb50ef078c56c9a195940a891a9b53
pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 10988 bytes
font_01_sfnt_off0000e9c4.bin
746ca3dd35bda15ea21c672c2e4dd00f1db933210baa74c26189530ce22de4a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 17000 bytes
font_02_sfnt_off000115f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 16792 bytes