Malicious PDF — malware analysis report

Static analysis result for SHA-256 82386942249f44f2…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 15:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a3ccd969087e1772f4db3ced31dc681 SHA-1: ed217fc17efe444007e4a5f4ac63930d40bb1ae4 SHA-256: 82386942249f44f2223dcf82b7a9074db6ea87c026a01712cba13ba3f465a1b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • 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.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed8a45039---55866788042.pdf In PDF document text
    • https://aviseco.ro/userfiles/file/sasebi.pdfIn PDF document text
    • http://imaginove.eu/data/Files/wedesofokowiliji.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406f51bac02---64346883479.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/jujifene.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/dijabuj.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/bovobaj.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/mazatafufuva.pdfIn PDF document text
    • http://dejede.com/userfiles/file/50915460300.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301192a2f01---16436204524.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/17872249065.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130da348fed3---3690516075.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/wupun.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/zixejogadajareripipakuw.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/dugobokuvolimefeti.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/zilasowinenomowamuxizop.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331737c5036---35856685946.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/fofuwazeraguzak.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/17809299172.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/wenesazemedozabonexib.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/mokopoduka.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/62253784083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+marksman+putlockerPDF 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_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 18024 bytes
SHA-256: 2496f8f0217024a21fcde0226c10dfc38426d4af173a83d148b9ff78b27f673f
font_01_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 10700 bytes
SHA-256: 49b703092c9e15d6ac29231ec3fc2a77e68b8ff1fda98a49b95019b445aea996
font_02_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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