Malicious PDF — malware analysis report

Static analysis result for SHA-256 01da8a4ae098d5b4…

MALICIOUS

PDF

72.3 KB Created: 2021-09-11 21:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e47d4816759394b36d078073f7462b2 SHA-1: 841949ee70a9431dfbe691840e5b788fad8fc9aa SHA-256: 01da8a4ae098d5b4de27b6483e0cc26d5dfb7f75dc9b5f293f53b948cbcb0361
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, particularly those related to 'formcraft' plugins, suggest an attempt to trick users into downloading files disguised as legitimate content, likely for phishing or malware distribution. No scripts were extracted, limiting the analysis of direct execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3d27a200---60966578907.pdf In PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/36121251715.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e32c5f090---xunepiwimegonojilusej.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/57771387295.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/26426522083.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/21754966072.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/52a8ea6d8561c2d625d9d903261e8553/zopijifumokifopevewix.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/84922536955.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/42399755984.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2d5434087---67803361788.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210909012335.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/momejal.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/rodabanifa.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210903235615.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/18928598941.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/45160008854.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/13681912361.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354edb5157f---50119488180.pdfIn PDF document text
    • http://master-vin.ru/files/file/74365351402.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/weralebujajozinilokiged.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/90897746686.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/wudawenabipofarelu.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/47547646950.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/bexemurobowebawute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+ragnarok+x+next+generation+apkPDF 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_off0000b7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B9 10680 bytes
SHA-256: 29b0613d7ce744465054c0e36fd418b9e09ca729355a86d738e87f71c418a274
font_01_sfnt_off0000d02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 16876 bytes
SHA-256: c51b2b2f4086f1fe5cd6d2ccd6e3b01efd900ec88ed24e08bdadd0763734d69c
font_02_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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