Malicious PDF — malware analysis report

Static analysis result for SHA-256 142031952a1a52fc…

MALICIOUS

PDF

93.5 KB Created: 2021-07-01 17:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d203a4297814145730c59c55f9fd0740 SHA-1: ac99f9f716331d1a712419f0f8719b9d157f1ca4 SHA-256: 142031952a1a52fcd99bdbe00d3bee0e3a574d698c4e5b859771f68c30fe3e91
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://printsolutions.ro/uploads/wysiwyg/files/25874483374.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a27e45f2a---70088538897.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e1501d3e043f848426af20497bf09ffe/47131816654.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/58i3nvfggkq57ed60tsnhr51eq/memurom.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/rigibunomifojaniduk.pdf
    • http://sklepjola.pl/userfiles/file/pezirufalososazafesepo.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a092a2f9fabf5791d307bac5f9356025/38560611358.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/06b6dd7c55ae3b06ef7aa4cd722a5d0c/47645858583.pdf
    • http://arredamentoambienti.it/img/file/70134154679.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ecb1c239c---deguditexaripibuxe.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160757aa08c131---14693094928.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785f0e846b8---kugenekujaw.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608324cb43a81---21072879352.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8433ba5569030b06b3f8c00b73812191/rezuzonodoviwapiwukuwuxim.pdf
    • http://royalwedding.jp/images/blog//file/vujisolosuzekomadaduwoxu.pdf
    • https://computerzone.pk/file/binufirovefugudavelagofe.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b80d3a9c---72604647601.pdf
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/63879323819.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733ff2c1f9b---15819490447.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbd885ba31---46392316673.pdf
    • https://internationalmedia.com/userfiles/file/gijisixenudojumomal.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6578d0935---zazidovadiwejotukuzigi.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160723f1df1b1c---dopegurufimele.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=quotes+ariana+grande+songs
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e1.bin
a6f47fb89c36a0b0be09ecff2f8f51040ea5d81ff1ee61ee0f295d3183ac0236		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 18140 bytes
font_01_sfnt_off000122cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 16792 bytes
font_02_sfnt_off00013ae4.bin
7693f185fd3c35552d8465bc95124f13e91fc07c6ddbbc444f5e7cabaf8242d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE4 10536 bytes
font_03_sfnt_off000152e4.bin
94ada888842219b54f0bff61c05754c95ee5bc28b4560123b174b2ad5ef12220		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152E4 16144 bytes

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