Malicious PDF — malware analysis report

Static analysis result for SHA-256 60ade6135b53f77f…

MALICIOUS

PDF

103.3 KB Created: 2021-09-01 06:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0fe1502add2e22bdf67648e4b15c09fd SHA-1: f8ac9d8aea87f644e6f6264bfa14b345e59be497 SHA-256: 60ade6135b53f77f93a679971ebe0f6519ba03f8eb3160e439ecc329cb12c3ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca723b6a40---90114623163.pdf In PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1610be923b8d65---65505872626.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/36107015984.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b891a39ed24---dexusijagigutoja.pdfIn PDF document text
    • https://isleo.com/i_photos/file/10533584161.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/xirutu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3368ef43e---1557297549.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/264897cda622962dfc82e64232aff848/26364885998.pdfIn PDF document text
    • http://teakdeck.pl/files/file/vinerar.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/06e6e5540b45bf1a40f57902489b920d/80269790525.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f83387fd84ca37c624a903ba09a800b6/piwufu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f86bfd56e794cf287a6818634f28c9ea/62521877877.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/27865918417.pdfIn PDF document text
    • http://humanlitech.com/files/files/mivofewagemukifofa.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/tijozaxijolasog.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/65382991550.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/8uf6grt8dl7mmsthh2jr804vq3/59186188359.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/13721426194.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/pusinesewo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e5c19c1a12ad290c0fe20a1df33fdd76/telafowipaduzuxuteveto.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tb8gg2ps95gmfuv5ltihvojjai/buvitolejisejefodi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098132bb05a8---56761916928.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/loxexedotazuz.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f98177d2f---74515407040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=greatest+common+factor+of+16+and+24PDF 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_off00012e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14618 18640 bytes
SHA-256: 5cd074cef009a7317ef304d16b32b9a6d7dc7409c7c7a598418e63741420789a
font_02_sfnt_off0001761e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1761E 10956 bytes
SHA-256: fa804e04b4ebd69ad609cec255a04d22a67c86f06e8bf027de89b32518ce2311

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