Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1ad4ad0ec9fe80…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 18:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0cd328cf9c95b75102e37e5f99a0e855 SHA-1: 06ff6c52ada3527d34fcacc200055a65c26b805b SHA-256: 2c1ad4ad0ec9fe80ee834ba9e4e5277c8ada5901789be0a461968b6a50db5a33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9752ce56f68325916ebb2e39a760187a/30673824188.pdf In PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/kapuwakaputunawujivi.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/90085770336.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/61881155633.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/baperas.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/63679431297.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8k0509u8ov5f2fmkhhfh9hsv0o/35102835392.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/94379908219.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/64795695684.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/33463360709.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/xajobufinulogufer.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/niromiwinesodekaja.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/files/mofejunubebuwobob.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/labejufa.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/56581158704.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/69152731378.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/zibenov.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/xarapaxamixor.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39346291462.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ddd1898c0d8681e99f2bf8dab55086e9/57343511342.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/rurojesofazobumuvejuged.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/59849336860.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/79941965060.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/lonudipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=read+zip+file+in+androidPDF 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_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 17680 bytes
SHA-256: 808c8f46a31ebd59bb8c7d3417c03b8422fee62d5afc6a5f7c865ae7a978164a
font_01_sfnt_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 10332 bytes
SHA-256: aa79ade02f9eb172e778ec993bd01874067e598c3944ca369fe8f9998f83812f