Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff60acbb65491607…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 20:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2be2831f97047179a062c073c1d00094 SHA-1: 7ea25c146117f0f4b475d17f6bc866286f0b6f1d SHA-256: ff60acbb65491607a01ac3bc366d4038859ee3b7c78c654732afa86bfb04c500
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate it functions as a link farm, likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611b192eee13a---11278387499.pdf In PDF document text
    • https://educhina.mn/editor/files/61731442776.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c9267ddd9.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b053ca329---98238527506.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/niwusema.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/74019031381.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/28548379902.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070162412471---51120587195.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/e7711b41c199273354959a4d4c6b9e14/8882341657.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/38558998781.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/numavutom.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f40c6d048---repilupewizetukezok.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/mozedasixuz.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210616112038.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/libatujoxeson.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ueglchq6krd3pka4q87tn2vjvl/10143936399.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/70514144131.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/jqq2an38fq21tu051dfin7a2a4/jokakivum.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b2ve8qev1q0k5eqh13hn09ghb3/35883379870.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f702fd93a8---50971704538.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/37224170419.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/59213624156.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/mapugafowazobuvulenip.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/33426811119.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/41183366032.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077904b8e031---tonunatuw.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/965389100612c88586fc1f.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=convert+doc+file+to+pdf+using+c%23PDF 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_off0000cb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2F 10832 bytes
SHA-256: afcce17b03bd3fad1579fd1775927aa40ec684c630476d2e8c9f11db2c90c764
font_01_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 18516 bytes
SHA-256: f7eed2bfc3627cde7bf2daa495d1986b141ad9e736d746d2f3796b5abaee602e
font_02_sfnt_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1