Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e326a8bdb29b4e…

MALICIOUS

PDF

72.6 KB Created: 2021-08-28 12:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 167b808faea74880d4497fc463519d1a SHA-1: 46f2cadb9267e42bd675609e93af43a5856d72c8 SHA-256: 56e326a8bdb29b4ea78127b760775606bf92c621c0d19c72714777b93deac7ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, with many pointing to PDF files hosted on compromised WordPress sites. This suggests a phishing or malware distribution scheme where users are enticed to click links that lead to further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086070b0eed7---gemupuj.pdf
    • http://lamachine.nl/userfiles/file/nemikasezedevaka.pdf
    • http://xahscw.com/userfiles/file/fufifapifoluruz.pdf
    • http://annandale1963.com/clients/69704/File/joxaxawepitu.pdf
    • https://baxsporthorses.com/userfiles/file/jotosifetidewado.pdf
    • https://bio86.net/fichiers/4151361378.pdf
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/masenugoke.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609226419120f---dozipizilajovowepadegov.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/nr92slu3qave931qlsn1c63512/20197904126.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/v2e1vcik579vdfps5uiiola8n0/sisusemapo.pdf
    • https://bistakalikotenetwork.com/userfiles/file/fasatufaxexesazoxuriti.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/tetemazeramir.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c4eb29c66f7f8ce1b3b6245daa065b6c/ximurirupurowixonufira.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c998c633b300d631e0e9711587f75f8/22225982798.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/be6f65ef5c5cfe35d0ae1cdf642931a8/mekimibufanajik.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f75d514496b26f4f472bc4d8193290d1/83322318592.pdf
    • https://szekszardportal.hu/userfiles/file/vavufagesemugexibow.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf8258b53---82606216988.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16077c281adca3---bebuzibidokabe.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b80849ca---80202834470.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f814e5dd---topizidoli.pdf
    • http://krikrik.ru/uploads/ckfinder/files/pesarak.pdf
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/16562178146.pdf
    • https://yesilkoyluleriz.biz/resimler/files/ruxewu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+quiz+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc91.bin
c7358386d068162ebd0bcd325af7d34dddb0aa7c9abed8fc6b8ea222dfd3e0ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC91 15724 bytes
font_01_sfnt_off0000e46a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 16792 bytes
font_02_sfnt_off0000fc81.bin
a39a67991a9791a450a9345e50bc9a89f121288e0dc33a5533c7da08f04efd75
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 10484 bytes