Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b23e73de066e3e0…

MALICIOUS

PDF

112.2 KB Created: 2021-08-06 14:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55d1ebc5f91e24bd94509f938eacae14 SHA-1: 743fa52f8f310d1d24dcba60c16878c56615dd13 SHA-256: 5b23e73de066e3e061b4428c93249c29d5cf1820a2dcfdcaea2c26c4c64fff8e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or spam campaign. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9598

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://faisaltowel.com/survey/userfiles/files/65347216437.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/aj6ekpt2g0bjoc6un9tfd05oem/vukuzafit.pdfIn PDF document text
    • http://texmet.pl/userimages/file/teletofanagexididumu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e59ae9a113888d373b56cb6b1307471a/wapunewumowimu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71dd1757e---tibibosegawafumarobogew.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/zitit.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/22b044fc1694ffbab0ec7934768e1614/mazijivupuz.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7f34ceec453c46b055cbca927e159e91/rirumol.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/3793502868.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e755c931d---63167625933.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/bugim.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/g7p7eeqbsa6ia3en5ujkenhvgl/56126649656.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca791a33af---98059810306.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ae4e407eefbcc9f2b6d87b81b772dac8/36907300101.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/xirakapawed.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8566eb8af4a2d0d0869491a16a8ba7c1/julezinejeve.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/xuweperatari.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7d32e2de6e141282bd11e754f60b08fe/18133411243.pdfIn PDF document text
    • https://ekransamara.ru/files/dukavuwexurus.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/j42fo33ig7qsh530rhmavr6i2m/47232597544.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e3e7ec1625526fe2cfe0da412ef78df5/nofovoxajiguzejotode.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/977dbfaa759617638344b19aaa6525c8/dedos.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/tufosamujakarimem.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/jusoduvoboxisivilipujesov.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/10703787018.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/didijuturakosoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=andragogy+and+pedagogy+differencePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14109 10576 bytes
SHA-256: 3b8e0346c1773dcf3e44bd1bd013aa4f61d4e30982d2391296771b6c14057fbb
font_01_sfnt_off0001591e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17130 17004 bytes
SHA-256: b520ff273391e7f7086333aef118a1dd3fb546d2a311ce83c9262240b07028aa
font_03_sfnt_off00019d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D6F 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d

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