Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cdfac24c031ddd…

MALICIOUS

PDF

74.1 KB Created: 2021-08-06 16:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 069c1d1231c85e62afaea70a18028991 SHA-1: eac70dd698913f8e716ecaa83a11b7afd502e12f SHA-256: 61cdfac24c031ddd9889b7e806bcaa3998029010e79689162464d278d5e2bf88
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it with high confidence. The primary function appears to be directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/763hg7qu4evvq8vq5c1gca1abf/kaduzupofar.pdf In PDF document text
    • https://oklogistic.lv/upload/file/41226624003.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/mozaxexadamed.pdfIn PDF document text
    • http://limoride.net/gallery/file/funuwijuw.pdfIn PDF document text
    • https://webhosting4.net/media/file/36841398218.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/15959394503.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd5e1b64f---pubozugoso.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/kulexenexejewuzu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/lqk27a0ev1d51tn6p3j3infagc/90590941268.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/98169895502.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/zezewinidupezigamud.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/fbbdf9b584a769ecea73fcdb28de8206/kuvabiserukanugigafalifu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ef08de1ba556e44a0ebe34f7316c9d51/nonekuxesuvupofipagezixi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c62c56d740c---xifexulibof.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7879u5h9vogq6j6hv6k98hr8r0/36886513735.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f7097edb282---4527574987.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/sixifolusox.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/tir9d9lle1305lm75k211eg40m/83909047252.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/6im9abdmrlo6ae5qg3ptlorj9v/debukexukusobevo.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ljp4pdmemuppjqj3hlmthchee/wakomi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b627a08ca0---vokilikefasunusowekekun.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/97831993151.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160e76e3eb9822---pifexalaxovebawurebero.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/194e18b7d95bce77871a502ac90ef534/jumoxor.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/viguwes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+printable+lowercase+cursive+lettersPDF 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_off0000c20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20A 10736 bytes
SHA-256: f49c286f34a6a767dd11fa04240072e2a87947cb039b2100d57e820887524466
font_01_sfnt_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 15572 bytes
SHA-256: 81791a84a8ebd19f36a57582dfda7defdca53cc5fa7989ad112dd061107d7d89
font_02_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1