Malicious PDF — malware analysis report

Static analysis result for SHA-256 1723c0dafc08bb40…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 14:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e1612b62736c61bed17dc9d4659ffaf3 SHA-1: 243a123332b18e4cf3f70b83605764b904f98f8b SHA-256: 1723c0dafc08bb40620d54ad36ecbd445c6e43b48f444cff0f407ea425784528
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://aldara-latinoamerica.com/userfiles/file/bumow.pdf In PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1r9ufovvtra0ti1v6vie95n6v5/jakeponiwis.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6398347b7---vurabif.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/27754301962.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39d5716ea---88850093059.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/3467575523.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3923a33a---kamusetur.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/resakupofanojalibagados.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9eb3000f0---serazasama.pdfIn PDF document text
    • https://oliogalanis.com/file/xufazigufakoxi.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/basetadedojazolozejobi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608059fadc5c7---66705398624.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fd555g0f66b6v390auv66j9nc7/51513758324.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/c757a4e7ca28e47afdce6926afa07ddc/ruxemirevazetinupi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b96bbaaf39---tilenavuzuberagizexagoluk.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/dojofafemewo.pdfIn PDF document text
    • http://hasyo.net/files/file/41051027202.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccab9bbaac5---tuxorebovadetewikupu.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/rebegalujuki.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/deqsl408dno51jlbn478voi5vr/85673002910.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/72988004105.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/6fc57093a76834c858432992d2ed4d45/41475816371.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c821828f886da4cfadefd0779d292008/temijavinadigubazomave.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/tiragezujapawupabibeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cares+act+employer+payroll+tax+deferralPDF 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_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 16832 bytes
SHA-256: ab9bf493eab6baca6ff2fdefb5a09e58dae24c7ef8ff8004cfb461730e87d1b9
font_01_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 10832 bytes
SHA-256: f0a03acaba22098e30c7b9379d18bc01644a24c73862f0702df415e76cf70725
font_02_sfnt_off00012cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1