Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c72deaa73d7d33…

MALICIOUS

PDF

86.3 KB Created: 2021-08-02 21:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cbe8b18216bed8552972ec1aae572c29 SHA-1: ba3af9cb32629b3c2fd1bf1c7a97155377ace521 SHA-256: 76c72deaa73d7d33b709af9081a117206d18e1339fd04715d72726ad611ad8ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to various URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute further malicious content or phish for information. The presence of search engine optimization terms in some URLs indicates an effort to make these malicious links appear legitimate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d0aa753f3f4257d2bbf26559ae9965ae/29499074472.pdf In PDF document text
    • https://paymentor.nl/uploads//file/fodikaxubewunikalejadibo.pdfIn PDF document text
    • https://yuss.it/file/6523631367.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/8b5f7df1085e7a155b6cdc42daaf9708/gutopexabofetewenafu.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/ronivutenupemonamizov.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/letofutegejak.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/vonux.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/41613223005.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecb5d87cd8f---kaves.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/7430a335337dbe97176e8c01055c112f/bagukadupazazabafi.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/numotosuliri.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/26795184962.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4a3c35e8---96925132759.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/posolixepebeb.pdfIn PDF document text
    • http://annabarons.lv/files/files/34932621133.pdfIn PDF document text
    • http://mp-journal.com/media/file/93951113552.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/nadulizenuzorosibevuwogu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8357a6daac039c3e05a875e74bfefa9d/zinopasidijuza.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/gemukoginug.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd123258b99---bovirowugujapagapome.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/8826385390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+v+apk+and+obb+free+downloadPDF 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_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 10652 bytes
SHA-256: e97382ee92c2c8231fefddfad60be88483d65b8b407ac287d6708748227ab36d
font_01_sfnt_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 16916 bytes
SHA-256: c69606df3b6d9f451e2865f046deaf72d85e31467174afb0351089f1d176acb3
font_02_sfnt_off000132ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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