Malicious PDF — malware analysis report

Static analysis result for SHA-256 37314c160b8bf6f4…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 09:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 854bb525c74e26627f31d4e076a1bb81 SHA-1: 373c49c9f9f5a42f123c7003edc8bd830178b354 SHA-256: 37314c160b8bf6f463a8de83e9d1a5965b60162098ab340908a850c189216f7f
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable domains, suggesting it's part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or redirect to a phishing page. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism via a link farm suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://acrclubinversores.com/files/galeria/files/26270496760.pdf In PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ad33ab3bb---xinororotobu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/213506613.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/vmr7s7dp3c0ko9s4l1hpv81384/xunasuzuvipisawanipo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c592973c63---32201339346.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/b5565f9464b574a47b39f56515035d84/wijisixovunimab.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b57629a2453---30748470037.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///pixitawale.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/doxiw.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4ba7bbe0e---jakipabilodikotulovipejod.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/53714683049.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac2bbc0002---63688974579.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/4198428127.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/givixajuxaragebamap.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/35041332386.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcd76cccc2---26017898024.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/tobigit.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/1728905833.pdfIn PDF document text
    • https://servicepapik.ro/files/pirupojesav.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3f805b27---58773385019.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/77388289046.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/dolizepoxelof.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/bolegixumevugotitiwegodoj.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071426eb8f02---34743507142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+download+free+unblockedPDF 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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 10712 bytes
SHA-256: 03a7a63aa5fc2f19dcf181f16e3e2b429e712917552e15b087e8685e5b1b535e
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 22508 bytes
SHA-256: 62abafadcb63aa203fc89e1b92dfeb4fb19af3f16fbf8b5449d98c51a2fd5d63

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