Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad60c54d3f1c05ea…

MALICIOUS

PDF

93.2 KB Created: 2021-08-07 19:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b3345445fdf8490b6b42e8d62f3dca3 SHA-1: 471fabc526fb6208cc3f87bfa6baf9a977d0a74c SHA-256: ad60c54d3f1c05ea4bd73044112d70a40108eae6f1e52d27477f3623821bf239
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism to host malicious content. The PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251a341f03---wexijaxunepigelik.pdf In PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076375bb9ff1---mowebozekudowon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de454d093d---39155865939.pdfIn PDF document text
    • https://campermagazine.tv/public/file/10883277013.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/rujizawogili.pdfIn PDF document text
    • http://myphamasia.net/upload/files/supipikibavujugejera.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/052d8d2447069228af5632bc0250709b/solovisixituzin.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/dosaduxibiguxofe.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wagovopexutavegigezejo.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/58370191257.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/47738005647.pdfIn PDF document text
    • http://staropolski.net/Upload/file/86668594377.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b56a0a2e---51900714917.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/76157225420.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c7e7349c85c41a114909eeead1e3e70f/rajilegalorivo.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9321f632a596cff279d446f38bd18188/lofemeduwexikapexunow.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210513/file/16208599684049.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a850420d4---2470232474.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161075c402e0fc---vezibopojezet.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/modimegumewotojilugapom.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc2db31670---pukeduwi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610452291fcb4---pirulokazirome.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9f1aecd8f---77718964996.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/13851568361.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5522c4ca07---kikaziluz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160757beb574be---mamowowuvobavoturisaluko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=respiratory+system+mcq+pdf+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_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 18252 bytes
SHA-256: f2155d2b967bf561bf831295e36f84b2eff46c56a0e53c2db6056080fe5cf5e5
font_01_sfnt_off00013491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA8 11172 bytes
SHA-256: 2fc938035ec1a5f6641e4e53cf61b5f42e1f5aa9cef66be1257976f021529c5f