Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d88c2679b10e5c6…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 03:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9ffc8160a938b1ea9376d5809936ec29 SHA-1: 8eb34db354aaae01f6cf06fdc3f8de4ee2631e35 SHA-256: 3d88c2679b10e5c603792bc24ea289c4a79876b3280265f4c2a299a6a5f527fa
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 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 https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f81c5e25758---relov.pdf In PDF document text
    • https://triosms.com/userfiles/file/12091896746.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/80991553464.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/37b97e6e297f2f2914dbcae22fc807fb/zezexafuvazotedopes.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/nosuvi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba4671d54---80496886621.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/24694225675.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5c416db41---zufugegovotugexopoxazu.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/81995658526.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4578b813da---68418714169.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/tupowenuba.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be14e026d3a---rofesupabavirixita.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/omup1ba18fb25v1151khqui89e/32018552764.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/021f6c27901c4a5a28303e44ec11ff66/45921421496.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/0a2042f08b7e98c1e9f491ffc1f77b02/suworid.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/71672424762.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/61721576191.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079d10eb6c0a---49207106039.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/71172052545.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/64c98714d42b5ac94bbd797629c9d5f9/wegibitovizaxobafibuxis.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b7627791c54---92790342629.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/057cd20e218a4a8836b4f5da53bb8279/68162347785.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210521090606700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=contract+drafting+and+negotiation+pdfPDF 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_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 17756 bytes
SHA-256: 1f85d423653eca0c4fc522a0021bfba4a05f8a7a3ac6c0be864e2fb209c745af
font_01_sfnt_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 10612 bytes
SHA-256: aa1838bd8b6e682f002f689a4b6e8b37ee99a7fd325cdc275f2d9fc8925a4bd2
font_02_sfnt_off00012f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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