Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d73d983c2607eb…

MALICIOUS

PDF

81.3 KB Created: 2021-06-26 07:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b0fa34b71b953a9e53bcd7219b4dccd2 SHA-1: de5320bdeaad070d5076cb4d63f80ab7424fdb89 SHA-256: 47d73d983c2607ebde157f391eecc074b31089d7b2e84b7047b9321168d96687
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external URI heuristics and the link farm structure strongly suggest an attempt to lure users to external resources for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a849c93cbb---wagudekeziwoxafepenef.pdf In PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210603172712.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/navenixekozadarikit.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xizepeduxeputufofame.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/abe7cfa9fac61372df7db67950c8edfd/sapivuruneletimojoli.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c0639ee90---98546640210.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/suzilezulitisulevog.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/wuzosabitimivusi.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47f13c044---57348884692.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/voseradegarefevekatib.pdfIn PDF document text
    • https://europartner2.pl/uploads/52890113818.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/82351050273.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a453b7340e5---sukizakakusabisadipoze.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/fevopidesorivedijisat.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/97461275291.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/21640199995.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c409486a2---jujizefewogusulimule.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/92970187137.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/10566078716.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/5147102450.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609636af19c8e---59838194241.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071b231c742f---tebarifejis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=adjective+and+adverb+exercisesPDF 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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 10616 bytes
SHA-256: 3bb67a4f9560624eeb2ebbeb781a00141ebea636e1b7ec24b4519a115a12d523
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 16808 bytes
SHA-256: 1e0840b553b3245ddede52f1d236eef820a5577d81f031b0524c046a9697a9f1

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