Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb9107831190fd6…

MALICIOUS

PDF

93.5 KB Created: 2021-06-28 07:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5940fe186258a32162a5a45e2433d58e SHA-1: a0160b1b1ead1644fc5bf14a566dcbc42bde759d SHA-256: cfb9107831190fd6917601b13548894cd7e6bd4285f1864fc4ab398934ef0de6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to lure users to malicious content. The document body was heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics strongly suggests a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://medvor.ru/uplcv?utm_term=lanky+meaning+in+english PDF link annotation
    • https://susta.vn/userfiles/file/pedanafugobofuxu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b931594a2f7---23891054444.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097607ac598a---6283248558.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ab443b697553242a155fea6acd867778/50374819820.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/dqevbtdc3p9385fntsdilg9qd4/49886898013.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/kinuwilivuwebokesona.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/44621400191.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/03af1de2cc1e88861aad8a8a0949328b/vajexam.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/in6lg5spmofouh80r281i00ngt/35901032126.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/sizavewofafodowodo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8dede521b43444053f2dec1c7aff637d/96301611779.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc0897fb9---46077971971.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609297ae07fca---zimiv.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c893c155d---96692889634.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/67362139307.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4415916650---17674727423.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a35c4bda57d20501057824895cf542de/86179158735.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/a6897372c5a8608c5e502c93980a27ab/rijonixiduta.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ec54f71e042473292b5044aa2c054786/57398924025.pdfIn PDF document text
    • https://anfauglir.com/images/file/83521798069.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/25433394769.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd9a54db1---79406902579.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000117bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x117BD 18896 bytes
SHA-256: d9d3667423c55b29a7b04f0886c7812406185bce7585917bd6c3babdf62b1c61
font_00_sfnt_off0000ced0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED0 24132 bytes
SHA-256: c0f9e0e1b5f4add2ba23e7532038936c3417dccc5c2a9be536df7cf2f26699ca
font_01_sfnt_off00010a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off000136eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EB 10400 bytes
SHA-256: f4a41e2e84a4fe68e151d6295e764bb9a70f98323e47075e176bb9dab4d82830
font_04_sfnt_off00014e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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