Malicious PDF — malware analysis report

Static analysis result for SHA-256 195bb53b3c90705f…

MALICIOUS

PDF

83.1 KB Created: 2021-10-06 01:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: decc9f4e4f59bb55e9b85d2d05f9f431 SHA-1: cb20c99237e0d7fbc02336cdb08c597a01016754 SHA-256: 195bb53b3c90705ff6640f9cd26a262f9f4097a3b8c7198635c7a39ca665654d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to various external domains, some of which are hosted on compromised CMS upload storage. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://restravel.ru/ckfinder/userfiles/files/70524633730.pdf In PDF document text
    • http://amsuatrust.org/survey/userfiles/files/vufesos.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210906222318_815142366.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/dereneriwimomimidewamuxat.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kamvqtgsqk180bndiqk4evmqts/67176988678.pdfIn PDF document text
    • https://profm.hu/files/file/lizosure.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219310565.pdfIn PDF document text
    • https://curvy.tw/upload/files/6703892737.pdfIn PDF document text
    • http://cloverdiamond.com/file/jujef.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/45604165859.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/lufejodinu.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/48707025883.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/zurapajuwogolejegujowikax.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/75170636097.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/wunavoxukobel.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/43486485888.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/subipir.pdfIn PDF document text
    • http://teakdeck.pl/files/file/76657750927.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cb86124ad15f09f4f0f4a2ebcb089489/68499379608.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/79283169450.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/mevawinateketomodu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/thgm44q15gcff625vfvf9evlai/xajaget.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/bugoduwunakubejoze.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/40661589084.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/2587708584.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed033656a---86375751807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+many+months+is+a+school+yearPDF 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_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10684 bytes
SHA-256: d6b28f514de31fc0ecf9ef539dcd4f3782c264f04d87d967ad8a8570a3805711
font_02_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 19824 bytes
SHA-256: 84c1d7f0240f9f0c06a61a774664d35112a4931fd1fb36cef135b62c999604dd