Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0919016e557b7f1…

MALICIOUS

PDF

145.1 KB Created: 2021-07-06 06:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4bf1098bd5c45b83ee1373c50aca25a9 SHA-1: efccf093bf72f0be52089ef16d1c9d91d9aeacc6 SHA-256: b0919016e557b7f19e2b88f24e55c1b1d06728d037cd4f8b91f8fcdbae639593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure suggests it's intended to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/rewojepukesupok.pdf In PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6fc99ddadf7c08ad124804f60cbb14c1/20206686897.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bfd06a4e7---45496541639.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f250191420---rafabifamidoneleda.pdfIn PDF document text
    • http://halaljones.com/uploads/files/kixexipuboxo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9rtqeqk3ad5sase1jsd1rfjjq0/ridopadoduwerugonosevek.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/0c85851b61e7c6d733e5dcd715d6458a/96037694159.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16082f4c6db051---43998713750.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0969bd8d8a---bozifonejiwa.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/10587974170.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fd14f9ad527f396e829928c24e575c5/4050387252.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/26461f44f43864c879cefc48f2c5493a/60662115100.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5bc8a090---wejotazuje.pdfIn PDF document text
    • http://shosholoza.de/file/6529259962.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18aee17a4a---buzolopefivikebutiduwiwiv.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088fc48bfaf0---82952933888.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c415a05fe13---redogoxetomigo.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/eb4d33dad04ebde25d175b6328197a82/batoboxopojox.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/13073975522.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3bb64d90dc90795254467742897ddaa7/88718647607.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/asuaoh69fv9koh02tq0bha8j87/wumiwulegavotidepugi.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a47bdaa8ea28ddba093dcbc4dcc58da8/58729695942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=2019+highest+grossing+hollywood+moviesPDF 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_off0001d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED85 11164 bytes
SHA-256: 38d1053815e01cbc72c1edf0847b64475f69769a628026c2a9702ff971372489
font_02_sfnt_off00020762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20762 18264 bytes
SHA-256: 04bd80c83fbd944936a932ef42879f4a164b2ef991ea001855e9a39af5c20941

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