Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a77a037ef18c9a2…

MALICIOUS

PDF

74.1 KB Created: 2021-08-14 10:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 51200826252749986e4f700e3caa7625 SHA-1: c7eeb1019fe2b46b5235759f4196efdd8cb25a9d SHA-256: 5a77a037ef18c9a21add6698d58c18161663151f1beeedda0fdc921b6977d253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a common technique of using documents as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=alien+shooter+revisited+free+download+for+pc PDF link annotation
    • http://stringquartet.biz/web/images/fck/file/vesadomebejorezadobifizun.pdfIn PDF document text
    • https://digireg.se/upload/53281672670.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210630_141400.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/59692112454.pdfIn PDF document text
    • http://allycatering.com/userfiles/68241493751.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/57239519346.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fb47dcf16---59725873168.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/71583666262.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/33305329917.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a911184dd1134736048e0bcff9b15a64/fosadawizoje.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/zedokolufapawifajujejupe.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rizuvuwemifuzuzus.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f3789f89aba8c000c272267eb8e17041/tovezebawitamuzarepujibo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9d4664fa3c80dd314f0097d631ec7f38/5868115466.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/tuxemotidusojifovefiti.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/xumigilalul.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/29330659977.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e43e19df7---rimufuxosuw.pdfIn PDF document text
    • http://digifast.cz/userfiles/81259721582.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a170850d73a---3342042030.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/80491101337.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe00af043d---lakugeja.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77bf3040a---wiwosituwelamoraralukofo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 10848 bytes
SHA-256: 40d9c2a5bc7f90141b083927fd8e73c1cb9577cbb2120a6bc90c3788edc66b9e
font_02_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 16460 bytes
SHA-256: 5202dd5fc913f250580637be3cea34fc2c797a562f680574eccc4c101abae967

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