Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbf314cc603134b…

MALICIOUS

PDF

81.8 KB Created: 2021-07-02 12:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 279c49b3eb317acb00c5911c8b05185d SHA-1: eefcdb6a14aae18374a66ce2da45bd788aee7967 SHA-256: 7bbf314cc603134be51eb2549317286a8973ce07307d9e5cbe8a94c0ed9191e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or SEO poisoning campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83b108354---mumozawasanamujevadofu.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/1b30e6a338006e7a644bab171da8bd30/87635570121.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a2534942f5939f6bf0500bd417dc902d/19824866823.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/jifivog.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90a81d07d---vamuvot.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/18803886131.pdfIn PDF document text
    • https://agatanorek.com/files/file/lezaloguzuwuwi.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/kofiradabujutaz.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/75549337911.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8fe292d80---11524641025.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/gedititevologaxo.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/kadobotekifona.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/geldlp9hsjictqqbb5lrm1l8g3/43795871914.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/gejuranut.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/25153948751.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/0fe3f1ad5bd5e1745200305437d78e1b/70291461436.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3415a70104df4f277d3400059eff1596/59452454818.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/aad407c795fc45e05a49d3a34f7796cb/sigelifesufinovisu.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7edna0alost71i97lvt88o4d3o/19492220363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=aching+in+the+shoulder+and+chestPDF 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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 10728 bytes
SHA-256: 1226dd65e3023f5e88e90ab2bab20fbbab788be8a1b856e3a437a879e6906bc6
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 16716 bytes
SHA-256: 8ccf0e496e61f2299e27859d7cade80ba5a4973c07d6a88488aba3ea41063a64
font_02_sfnt_off000121e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1