Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa762064b80cda76…

MALICIOUS

PDF

101.6 KB Created: 2021-10-19 16:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1751a17482e341c929a650c7ff6a6015 SHA-1: b38a6418ba12c967ac26967f57f2b0d93ac1522f SHA-256: fa762064b80cda764ace218c16f9a13ee069bf2099d5d415d8ef1d475d9391ba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Session Tokens

The file is identified as a malicious PDF by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a lure for MFA or one-time code harvesting. The embedded URLs and the nature of the lure suggest an attempt to phish for credentials or session tokens. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://oniceh.ru/uplcv?utm_term=how+to+get+to+netflix+account+settings+on+ipad PDF link annotation
    • http://dermatologomiguelgallego.com/miguel/fck/file/joxitu.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/poxikeledipeluburupu.pdfIn PDF document text
    • http://goldia.cz/data/file/25620082782.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/30553114855.pdfIn PDF document text
    • http://geasit.it/userfiles/files/jetodix.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/24130346020.pdfIn PDF document text
    • https://divinescience.in/userfiles/file/98356051043.pdfIn PDF document text
    • http://ecocj.com/userfiles/file/20210923000930.pdfIn PDF document text
    • http://weldingplaza.com/files/file/mirowev.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/tutiwefufikomiw.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/52713102210.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167786d61395---poxuzulabifujow.pdfIn PDF document text
    • http://onelove.cz/file/44750962059.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/fajimanogidakozozawe.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/9949661895.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/41961812259.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/sozesasesuxuwizoza.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/66975890273.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/19772512806.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/85309956676.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/femiribovibewesudaj.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1cb05ad3f---12300215668.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/tikosefofokesekasub.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/46068252279.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/rulodijuwerevomerisife.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158df491b48b---92801143511.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/sozijubidawowuwudino.pdfIn PDF document text
    • 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_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 20244 bytes
SHA-256: 561ee0bf7554019902f0acc87640113bf300eea53e8f2dd799d302835f821d63
font_01_sfnt_off0001562d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1562D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E44 10972 bytes
SHA-256: ba71bcd5620cf406b21fddd3d0e032e82e95450a27df84314f15a98c54a9335c

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