Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2ba3caad5cb652…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 21:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 381159382c9f8cec6edc18e928ea5981 SHA-1: 02617fd14c921ced8e9b44706a7038a9985d770b SHA-256: cc2ba3caad5cb652d89672219744e65fc7681307cd9eb596eecb2b7e26a96996
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crewmak.ru/uplcv?utm_term=implicit+differentiation+worksheets PDF link annotation
    • http://healthywithhart.com/res/file/faguz.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/33378626615.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6068657232660819ca87753f25b856e0/vanopipono.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/514a921b59e68dc6e48ebce549578b2f/zibixovibeke.pdfIn PDF document text
    • http://tfforming.ru/d/files/pixakuferew.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5acad994b8---fumabexuxafiximiwe.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/bumapobija.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7b31b1c3b---xasexivolikoge.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/delelivunukazuzojig.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/rafigabegisulunafemeto.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd661a134f---jetitoj.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/76610307618.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160771e7383c58---62559021591.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4e9b6bc3c4ba4a43d96f159e6414134c/19042197058.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d63d494c07---77572516091.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/53778159901.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/wixadegafoxusogenifun.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/bexuj.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/demolugumanodal.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/redofuxa.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/29287663755.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7491c8c7d---vetujipek.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801e4eab42a---metafidezabon.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/tevamimamokufokereterunan.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210811074308.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611742dd2e55b---29011358491.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_off0000c05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 11016 bytes
SHA-256: 2d600bfbb48250c056632f66818bf694c37650b07b503ae6765f3001d12d28af
font_02_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 16744 bytes
SHA-256: 0146bee8f0488467ab72983ca18b1e03854493c7406ff158832e012481e56e3d

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