Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ff4bd75dae1a7e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 16:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5fc102641206282b58fc9612795a9378 SHA-1: 81ddd4938a42ef836d9568897ad895244a961cf3 SHA-256: d1ff4bd75dae1a7ef62ea5c16c716b78c43283161fa53035aa0b201e87da4057
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, pointing to numerous compromised CMS uploads and disposable hosting sites. The document body is unreadable, but the presence of many external links suggests a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://chandrakantmusicacademy.org/ckfinder/userfiles/files/logamogegebeses.pdf In PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kafijiketefil.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d0e6033061899cf41ef2bfe2740ea5a3/49662760655.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/takaxobagofenaromag.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/81563242262.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/68393147629.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/mewagewujuzagukura.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/58612500962.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5fee070e---83095129176.pdfIn PDF document text
    • https://digireg.nu/upload/40206794164.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d8350e4a511---93402276680.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5a3f1eae28b0c5883f5e856c922024e8/73146489638.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6786d08d71e1fc406b0aafe70c8c9565/votijarevelox.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56080835762.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073bff09e20c---mifotawabor.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ops9vdc56pi5l6vroqjfpv5svu/61205675927.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/27817206596.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc5a94d8dd---54721567479.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/95453425826.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e9f6c722c---dimuxujapimexi.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/ridazezixev.pdfIn PDF document text
    • http://mobitransjogja.com/files/8868529990.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/88981870265.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/shmhgscn5qariu7kfshf643afo/babesiduxanitobekiradob.pdfIn PDF document text
    • https://85097781.com/upload/files/52816754455.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/96450561712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=histone+acetylation+and+dna+methylationPDF 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_off0000ca5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 15736 bytes
SHA-256: d620369623d0a8887196a0374a6bcfba7fea9dc6b3984cf8da46084dd6740f4c
font_02_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 10640 bytes
SHA-256: ebfb194c3533e8701ccb02d83928c63a0a1aea8974b5c63161a552a1b344c3a3

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