Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d79083614d914b…

MALICIOUS

PDF

90.6 KB Created: 2021-07-31 04:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed0fbcdd2820525fd4ba52ce5ad0a281 SHA-1: 37cf8980b53fed9aaaa6c89aa8aceaff6e80f3c5 SHA-256: 61d79083614d914b004f957bbe9e82ee77a96eecbf18e699c742383dd8fffca4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://quocteanviet.com/img-chamthi/files/83497853441.pdf
    • http://www.chatanakonci.cz/userfiles/file/78447423022.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5e125ac9d---zejotubu.pdf
    • http://adas-muko.pl/photo/file/letaninasilelekezuzu.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ccb20b702f0c4625d8604f4695726fff/97984549627.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b583d1a19---nipanopajasajez.pdf
    • https://baxsporthorses.com/userfiles/file/64980921874.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lai9jitcp3sdap2ghgjuifa422/54109963404.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4d44fff257d7ff1fe334ec57734d3cd1/39627253473.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d5dda8b7---37828001863.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc56b7b7ba---nezatamemusutud.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/3hqu73md53m5hcukh8jh98e4bl/35416733486.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9a18a09ace0ad494d4670455de13ce60/midajexabenovubuzovo.pdf
    • https://cmsschoolkg.org/userfiles/file/20691060957.pdf
    • http://hoshitorionline.com/uploads/files/73914736591.pdf
    • https://ezastupitelstvo.sk/editor_uploads/system/files/98554291798.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/11408017183.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ab18a8af907---88585483209.pdf
    • http://santeh.md/img/files/tikekobedigopurupub.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8135e27b0c---ruxad.pdf
    • https://martabaktelor.com/contents//files/60335873584.pdf
    • http://donateagift.eu/userfiles/file/42189807222.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6b7v4q5hf68vkergd3mabe20q5/15443204180.pdf
    • http://unipsyclinic.com/userfiles/file/20210527121242.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=frozen+2+full+movie+free+download+dailymotion
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd50.bin
b1e324e6d07898dd6a655cd17c388da3ba2f1118580ec1999b4e5bd3f37e51a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 17096 bytes
font_01_sfnt_off000129d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 16792 bytes
font_02_sfnt_off000141ef.bin
2d21472f9f414a78c8c1a14caf72909d3b485331efe0deef436665f0943ec54c
pdf-font-stream PDF embedded font (sfnt) at offset 0x141EF 10872 bytes