Malicious PDF — malware analysis report

Static analysis result for SHA-256 585e53aef3c48fa4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 18:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e3396e9e1870cc25609dac90e7191b7 SHA-1: 62f1f76a5e79862626c1ffe01582a5973802ba9a SHA-256: 585e53aef3c48fa42094c9f474244908c7ba8705f0475f8f4763f20209be1237
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. This suggests the document is designed to act as a link farm, potentially leading users to phishing sites or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://avstralianature.ru/ckfinder/userfiles/files/49031876914.pdf In PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134e90cd175c---48316064365.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f1ba99c1---bifizenine.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/23605794530.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/50795694857.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/tugisigaju.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/80097712711.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4c6ea96e---65532414675.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3c37a220---6319497076.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/5337787336.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/56986667777.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/meziwaxuwadiv.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210901_060259.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/88187339909.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/sitilitatazobotel.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_B8130C1510A591CC.pdfIn PDF document text
    • http://husplaza.hu/editor_up/dilemadenobusav.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/40634471457.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/130f7846241bdd1187ff08a33940734c/10909520461.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d945611e37---gamenazimalenetawa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5fb1eafa7---pexitipopazabugogokupoxo.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/pevug.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/panaregowebe.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/98579363360.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/99974789627.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/572deec7d68a12c8a2ccacc7828e7b50/vemone.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/45466523049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+issue+with+sd+cardPDF 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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 10588 bytes
SHA-256: 6d04959ccaf28c37ff80dd7c1b0685ad8d17a08dc0023ab40a68b43ca021d1df
font_02_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 18356 bytes
SHA-256: 4c6eed167154a7467834e8f5312b9ebeefe6970e9b2a714e22d53b3337d294e4