Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c72c45e5a1ab154…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 03:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff19dc606f707601d699239b0e43d712 SHA-1: 80734497055c9cb0665d1f0426ef7c9bb6aceafa SHA-256: 2c72c45e5a1ab154ca4360219e68f34e875221b27ba6010ba16dba2c3003c5f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=how+to+remove+miscellaneous+files+in+android
    • http://ehomeforeclosure.org/images/file/pewevadapiradej.pdf
    • http://xyr59.com/filespath/files/20210904230330.pdf
    • https://safarekhoob.ir/basefile/safarekhoobir/files/22934106967.pdf
    • http://svsteinfurth.de/radsportfiles/file/vakozijuke.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133646819549---26573187425.pdf
    • http://lasfyy.com/uploadfile/file/20210904071500060.pdf
    • http://getwealthythisyear.com/ckfinder/userfiles/files/35819775365.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/46803147681.pdf
    • http://potentialdesign.cn/userfiles/file/1630468418.pdf
    • http://sumisaedu.com/FileData/ckfinder/files/20210913_63DC14D7A70025A1.pdf
    • http://www.anjhimayath.com/upload/file/46793697247.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614200046cd13---sebebijonetuz.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/84671245917.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd1c97f16---kiforizuwe.pdf
    • https://tomclarkvoiceovers.com/userfiles/files/kuvaxinegexezo.pdf
    • https://taiwan-tiaya.com/upload/tiaya_official/files/52810060622.pdf
    • https://0900107678.com/upload/file/51139619512.pdf
    • https://ceylanotel.com/firma/files/dowafepipudukefolape.pdf
    • http://desiaussies.com/ckeditor/uploads/files/vofigurumakodivizuv.pdf
    • https://vcvscr.cz/www/www/fckphotos/file/54473028019.pdf
    • http://abnigakgdsg.friendship-match.com/upload/files/31827676275.pdf
    • https://2b3la571ga-70p.com/contents/files/53829056242.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e0.bin
b9b39f25df5fb003479ab42ebecc41d216aaef9d4180aeb3fc508cdc8a411642		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 16728 bytes
font_01_sfnt_off0000ffd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 16792 bytes
font_02_sfnt_off000117e9.bin
94bc59161d09e18c5dce56a6d26ce77ae2729dab5fb12294a460543a23d113ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 10880 bytes

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