Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e7ac77cd5bad13…

MALICIOUS

PDF

96.4 KB Created: 2021-07-07 12:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ff0f7ea451b9d97744e384b8a244a8d SHA-1: 394c3eda95e4469f650c1ffd009215b66a5088b6 SHA-256: a3e7ac77cd5bad13bc1f84468986c2269f970e26397ece0dacee586ff380ab8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. While no scripts were extracted, the structure and URL patterns suggest it's designed to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f4e8689afb973217601d5a78232831a7/18762304549.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8daf18fc28e34e650ac07ea69f7b4127/jujepufadigadinijelase.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/85683546311.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/vr4mtansk6d5g12te0mtf47oem/xalobukozu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa8f17ee7---57615022087.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4703d3fee---tamutawunu.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094400b9b17a---rulefofinu.pdfIn PDF document text
    • http://renovator.cz/files/file/lelif.pdfIn PDF document text
    • http://stevis.cz/files/file/bizabevazamudaposiki.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/poxoxekur.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b83fc5bf3---pudekoxabujaxozolemexotiv.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815a3e7c329---63297671914.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160859ef9ab610---5416410324.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a493268d96---daxufer.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/q27bro0cto8qmvif7tgfa5h6fv/87607369145.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/9669642051.pdfIn PDF document text
    • http://ipllaser.in/uploads/74993325988.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/6905548559.pdfIn PDF document text
    • http://korytnica.net/data/files/dosozewar.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4566da30d2---84826289817.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52c53aa36---nobidaso.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/kibipavuditipeji.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/6484e59e4a37fdeafa870e538ef13aa4/fajatebulekujofolijun.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/wozomijabinovidajimijo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/98ba8fc0a264ff823beb86bc6b71aa5f/14830081994.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9b401c81---fabowurevukoregipuniwub.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab25e426be9---banijazelufugudijenov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=six+sigma+for+small+businessPDF 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_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 18484 bytes
SHA-256: 474b0f87d689ef0d66516fa22fdeed9628ee66b9f29d66c096907066161a3698
font_02_sfnt_off00015ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE9 10876 bytes
SHA-256: cc0b91fcf0a162ae5382b2aaf413e9c1d927167eeafaf96f81ec661ffde18eb8