Malicious PDF — malware analysis report

Static analysis result for SHA-256 39295c179b06bcde…

MALICIOUS

PDF

89.4 KB Created: 2021-09-06 17:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9159dd969f24a654d22c9f294a0b128 SHA-1: 880f58620d86e03f3925e6528f60d640009d4f7a SHA-256: 39295c179b06bcdee1d437bdc2b3a84e1a38f5e98f989db02d58dcc863db218d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9598e9495b073b8cab7155965725abda/nisorepigavebawenetufaxa.pdf In PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772541de32e---bejiw.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/gotobufufida.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/37565931028.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161057719941f2---zasuvuvidor.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/nadaxixiziwelemetaluru.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dabupifudopupugumitedugup.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/84342154666.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/55ea51c32e442bcedf8443e13be9aed7/58228415947.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a1683388eb0---jawidotadozojigexu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161216ecc1aff4---73996564987.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/17095259833.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b443a9e0a29---43571680988.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/27459233415.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/zopelekidovenipobolekora.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/zokepolekodanogezutodol.pdfIn PDF document text
    • http://mcutech.net/files/julunemaguvobifoponuzike.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/a5aba43ab2a2fafa4d6dd587d0686392/56712245298.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/v43rrr9u3v8qghjse05pco16ak/detinejologubokaxej.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/gfj32ipts39jhdfcn3lompeo3j/vewudipevekinod.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c67ebf65006---pulajamadejifibeviwij.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/45600956730.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c86606aab44---wigukizamitegamoweginowen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=introduction+to+polar+coordinates+worksheet+answersPDF 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_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 18064 bytes
SHA-256: a03babc7ab68efd85d3da9bf366606fc389d8a15a722dec6839c96e68b02bfce
font_01_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 10840 bytes
SHA-256: 76c8848b8ad2709347201fef50ec1815f2990589692ac476a7a072e308a9cc80
font_02_sfnt_off00013dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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