Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85f97966ec6469f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 19:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4711d7a8a473a82609939c5b9d8aeaa0 SHA-1: d248619fbef6cc7987ab86cb6cd80c2f1ae25854 SHA-256: b85f97966ec6469f681e12671efff2df73b2a348d8db59c58784f92caf49b8af
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to external domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161354ae2e7303---2288454186.pdf In PDF document text
    • http://grupophi.es/uploads/files/86551732348.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/11299710436.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f13cf9c97e---tofavotukapezofibufu.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/24320890238.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea9d14b1bf---11341286618.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/94551705503.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/26148330250.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/tefolezewizo.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/zenuxatop.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/xirutugufupe.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61629251035.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/76033567928.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/xozukisavolevo.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/dumajoponejedaxe.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/93920653515.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/natenegetenulunovifi.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xogekobijok.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o8ibgfk4gjjj1momb2n4aj3snf/dunoxovupunodumos.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fcd1b5151a99563c130bcdcae3bd8ac2/rogitobekonowuvejoloj.pdfIn PDF document text
    • http://kasand.com/userfiles/disawujuza.pdfIn PDF document text
    • https://irantruck.ir/data/file/jawilubuwereduxoted.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16136d3ad42b8c---fufuwegorivikodusojorute.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/56496410506.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613151604c8d0---bolovigudomoxarinawid.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161372a9dd1531---lofikamezavinufu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135a71e0e0fb---bidasinojeroradun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=conversation+questions+for+the+esl%2Fefl+classroom+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_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 17572 bytes
SHA-256: 1a0b2e4e310f895c6c6c34d4f5b913aec83ef61e91107133825148559080447e
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 11264 bytes
SHA-256: 53a2b7c1ffbed56c2c2c5097c8c4003f1f2dffb239370b8aa3f4fbd1bf468c91
font_02_sfnt_off000124dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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