Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51b8bbf70bcd44a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 11:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7a566274897a45b2632ba50095d629d SHA-1: e810c358687e716b2485634d4a217e1ba593854d SHA-256: f51b8bbf70bcd44a7b96db951ff625b53a1c9c328486b630b99ec33f276fdc56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://binhvi.com/upload/files/jifaliwawitaloduxulaj.pdf In PDF document text
    • http://osmed.cz/app/webroot/files/files/poxejerorugomegumo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130085e99078---70647459732.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/61642711401.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/44138601167.pdfIn PDF document text
    • http://banquat.com/userfiles/files/75862107956.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/90162475992.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/77367174174.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/gaxex.pdfIn PDF document text
    • http://retailcop.ca/files/renejapejubovazatu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/fcd3d2209e49df8199d3781184738f51/86456550888.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-8/20210908150750363329.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sexixorebap.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/47499596595.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/12755821716.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/84912647056.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/54745949134.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613630eeb56ec---5674966137.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/vopogamelozomakiwabaniluw.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/janajosuzubigazogedor.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/bakozusoxifusexu.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pevorokujarodila.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/22196625864.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/69319285835.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/9667958718.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/zetarepetanoderugeguri.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/tadetuxidek.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/33147265528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=xnspy+apk+downloadPDF 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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 10260 bytes
SHA-256: 27b62c0751c87e267b6774102d4453c0562ee8ed2164416af8cd0fdf455b6802
font_01_sfnt_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 16892 bytes
SHA-256: 0f011879af861249dc398f8735f1f4cdbb717edf7a644e9b5838ac7b0cb31765