Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa6f61137ab548f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-29 14:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 940bc842e6b0af163a92c9cd5ae809bd SHA-1: d10fc53f52ad5eb76f798acd246fa5fcf141ff2c SHA-256: caa6f61137ab548fd51060d744f649db79629e032c2d70e4d6cd5a9b5876e845
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the presence of multiple links to compromised CMS uploads and disposable hosting reinforces the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://queure.ru/uplcv?utm_term=world+cricket+championship+3+apk+download PDF link annotation
    • http://findacommodity.com/upload/file/57820348861.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/14371427809.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ioqa3e5dhr4qo3m5r9flepe9sn/67622477171.pdfIn PDF document text
    • http://topflexsports.com/uploads/28469951723.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/73853224463.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/kanoba.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/73418943399.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/41292596165.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/81350757995.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/xusepizetoj.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/kenamo.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/kogazikadudewetifiri.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa71183fa---somigevurin.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210907154959.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cb2eae96dd53931f48870fd504efad23/52644050438.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/lojifujasizulazera.pdfIn PDF document text
    • http://seatraveltx.com/uploads/files/32435388850.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/netovadedosareri.pdfIn PDF document text
    • http://a-pluset.com/userfiles/47860796081.pdfIn PDF document text
    • http://cheevalome.com/image/upload/File/sedikeva.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/pewulixo.pdfIn PDF document text
    • http://vucert.vn/uploads/files/62971083846.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/lagizukezevomosiwej.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/bugup.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/43451418000.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614766ba1c508---vunixerasudasajum.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_off0000b828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB828 11124 bytes
SHA-256: fc333f9483ad6126193c5c42315c0367afeb75b1e39157709088c3a674a18d12
font_01_sfnt_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 17576 bytes
SHA-256: ef66492ebaec62119aeea4829d714b04ab655936b738fc276f30ee442ca5bfac

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