Malicious PDF — malware analysis report

Static analysis result for SHA-256 b675bb2381fc4c57…

MALICIOUS

PDF

77.1 KB Created: 2021-10-08 09:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3315405b0c402fa6aba51490ee491d1d SHA-1: 372f3247d30bd98b0517aa6b02a6fb7e91ac40b9 SHA-256: b675bb2381fc4c57f32c307735eef07e5448dd4442237b18358c48d6950500ac
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://deborahkay.com/ckfinder/userfiles/files/binizodiwig.pdf In PDF document text
    • https://ladangmimpi2.com/contents/files/71023549836.pdfIn PDF document text
    • https://egf.tw/test2/images/file/59433919504.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/fevasaz.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/pofopofomebenad.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109280357362536.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/6436064457.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/22418c2a453bfbc352049b2e01175dfc/leteza.pdfIn PDF document text
    • http://trivio.it/userfiles/files/54241070663.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/41811139965.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/dotixunalizowixutijope.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/2591152450.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/wonabuvele.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/sevizeri.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/51327172235.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/bonutufipovekir.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/buxipubatafudebowijagokiv.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161438da02b16a---79932707656.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/33218680197.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/xaxominimexeja.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/2oeqqi1ivq3hiuvfn4hhfor3sj/senimopu.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/20608046105.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/venomanimi.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/80447514356.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/lokovubomafitigederal.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/21313530767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=blinking+my+eyes+too+muchPDF 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_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 17260 bytes
SHA-256: a4371d842eee6e5bac48d62563fb141e9b55cf6c6545605935c4f41fdf4ab65c
font_01_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 10772 bytes
SHA-256: 4b179d0ccd136fe43353b2721862758018d83af5834dd4052cf4104c4de926b7