Malicious PDF — malware analysis report

Static analysis result for SHA-256 6581398e8705ce83…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 00:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cbb0eca482e596898af48d602bf7b6a9 SHA-1: 1c6ca29e24f4d4e45ca67197bfdab24ab0484c5f SHA-256: 6581398e8705ce83ac9c0719a137222b0ada2160ecd7a22c08bdb56290a67532
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2386bd42c9---pozuvuwujobivagaxukefem.pdf In PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/iq4m628q3davhm0lkktljpr6a6/87309726364.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/11496481661.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/6673730153.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee2f3a3f61---bamexefixarag.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a288d04955---jufawununojabevoro.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/11055715246115c9c76c7b9.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/bufipadizal.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8d8555ae---tebigado.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tnp8aj7tkf8ge4lb521gosccf3/zapawaraponexon.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/42353799762.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/51233917496.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/roloxabulofagifuz.pdfIn PDF document text
    • https://soechi.id/userfiles/file/durokajijigupug.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/tf1td97pu4fp875lq830ol3aq6/dakalaxufimoxawodewafagel.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b3771ae9---rosuwaliletakotiwen.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4190d534---togipipoletuwusaverux.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/miguwibenejoku.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/bumaxemamuxulole.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/2mgidue92tru517nc7nf5grbdq/jajupadepezinasoj.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/sorezo.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/19514051035.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/jatodub.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/9pple0b0iavcccoe0pmmgtm9v5/zaxofidawarakazemoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=static+balancing+machine+pdfPDF 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_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 18024 bytes
SHA-256: d05f7c71fbd32acb11efb151a3c352d95250dca311a2179ee44e391976c68fbd
font_01_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 10892 bytes
SHA-256: 78a489c009254e76b5686057dd074eb19ac13819722857db76c898cef22c17d1
font_02_sfnt_off000128aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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