Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb210c3d659ce61…

MALICIOUS

PDF

81.9 KB Created: 2021-06-26 02:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b06137c7d8240a248f2123517347a67c SHA-1: 594198a630c0ca5273c12c7506c0c7af958f8d9a SHA-256: ffb210c3d659ce616b4918ace2097d321c9377b6f02aa73361b22d5d730cfdd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme, potentially leveraging embedded JavaScript to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=bowie+space+oddity+chords PDF link annotation
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092712d22119---verulifezowujajov.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b4289b4d615---69212161324.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/j6ehvaj4uavv4qn1k005rakmvj/vepolesefis.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/ca3b9d1ba190b95a05d8a63aa93ac7ef/varuvasivesuvodevas.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/dikalatanezixugekezemijid.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/94851482601.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/namatajaza.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b785613d010---81520444965.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/41075635210.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/14/file/20210614_110424_126.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/52359113172.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/fujavisaxomo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b1971ce2b6729534333b6705a3c32f27/wenivozumiju.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/16566447970.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c2ea8e237---lefugigofivisogawi.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/taxupawezonomu.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/xatilexodewejiwifukavax.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf7205c0e5---fisitekizo.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/99891849872.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/fogomu.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/monugotowage.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab299378cc3---84337149554.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/b1d0f0b260ec756f5ab30ca0f3302686/bezoliwabalojuwet.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/1fac0f411f8ec124ec91a095f8fafcb2/jimekinuzugotomibizipu.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_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 17148 bytes
SHA-256: cb2dd5feccf64e330a13800ddde0263ffdd54e98e3e5a9f30aa8ddd5eb86d81d
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 10716 bytes
SHA-256: 281b2d6495f40081b7b770a6fad2fd98ba7256bbecf9a4406eb1f774cd74ab0f
font_02_sfnt_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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