Malicious PDF — malware analysis report

Static analysis result for SHA-256 b570405baaa86b41…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 03:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4259517bb7032f5565e67063dd5c5124 SHA-1: 72523293e6635c1120f176b28d387dd79c200494 SHA-256: b570405baaa86b41b809596b6dfff9e74984c8a06449ab3209cf85b2ccb38fc0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of many external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=hp+android+paling+murah+dibawah+300+ribu PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c33db1c70---95679493890.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/45494844458a02bb606fac62d4ed022c/88219522119.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/47535967215.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/934a679869d8b36a0207314160a7b981/xozukifoxax.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/37686728846.pdfIn PDF document text
    • http://www.toptehnik.si/images/76730771397.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/79546406169.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/53171538622.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/66932888007.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/28897910332.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/ligigamisogomot.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/nibebuberinoxolana.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613838d8852b6---xigiw.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/mebidofole.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/rokosavubabigudafidemu.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/1315442257.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/golufutavesil.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/25604049307.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/vomatim.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e340c33b8e---57335017190.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140af98ae259---xuvasulebugowoze.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/65182368104.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/52521485784.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161336567e81c3---25460831695.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/72612632094.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_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 17352 bytes
SHA-256: 60fd423b91fa3521b78779e55cb1a70230ce5f6260ad99eff722c3c1c68ab204
font_01_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 11052 bytes
SHA-256: 50decadfb802bf038a2447a9d0e7901799c3c97c33c33cb19a1b2df098f93f1b
font_02_sfnt_off0001242d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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