Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f445455bbd74457…

MALICIOUS

PDF

75.7 KB Created: 2021-07-20 13:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 63e121b7d1d9b62389a855d134881e91 SHA-1: a83379a3687222da2f0ff1c8503e660a849390ae SHA-256: 8f445455bbd744570d6a01c2917d56dc862c2f0a267574f3935c4cdbcd4ca567
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/vbgf22b2d52bj3qvr02q0627pj/67783956584.pdf In PDF document text
    • http://residencecarlofelice.com/userfiles/files/83124158586.pdfIn PDF document text
    • http://rafaelokazakov.com/file/releguporafejafig.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7cd6aa47634e72724e6a717cce48c590/52610094323.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b29d70cf---96175093710.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707967dacd5---5374812975.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f45302df67---79641076956.pdfIn PDF document text
    • http://vejwun.cz/images/wezokoxeguwezujuxepepiti.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/519a2f1c9a149ae45b89ea01a849f1ad/11469818244.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/sakaveborezitor.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080c91e2b319---wudaxipatogewuwinof.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/93466008816.pdfIn PDF document text
    • https://norservis.cz/files/files/69227530030.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/62287275154.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/ditolusaxinejel.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8f039a10b0177b223a74ea24b0c23d3f/3080141343.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b50449c3011---72870860502.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076552ceaf36---kimikosonodimobe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/59288854284.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/09ffrovtu0760chngl9dp7ccnm/xegiwaripilonuvefatofomu.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/dejipeziwi.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/48809261502.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/24cb6b06ea89312c0563c2759da4361f/49578901040.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/30805163873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=serial+peripheral+interface+specification+pdfPDF 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_off0000c3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EB 16996 bytes
SHA-256: 3dc54210e33aec8a68a297a501c89c78e05b6006d0487db15406b02b2640b06f
font_01_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 10792 bytes
SHA-256: 41d3ff79e994976e3415d3a19ce641789d8379a751ef4ec627ea617baa3640bf

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