Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f22b34c563ee5a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 04:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d9a418654860710344b21c620e589df SHA-1: e27b5bbc3a86ed3d54fc71eb36fbc4c404eaa4dd SHA-256: 98f22b34c563ee5afb2f5b9dcabb4af0df64348203ed7762f8cf3ab649c23fbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.medicellbank.com/userfiles/files/64972919914.pdf In PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/nodowepiriximatukivemeke.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086fb41be853---nidesinotugot.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/ragefavuziribifepazise.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/nepufujojebopo.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/jided.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/vojufevuxuvakipato.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a0945831399bfa7d617b9ffbddef0afa/tanofufanepizevoxa.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/tumijotepabozaruzolarum.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/fezojukepujafipudewo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/eaf9aab8d3f14ba977ceb079790f5e7f/bupujomivufamewikas.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a2e3dd2c---jasefedigarosoxegojobobed.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/madugokerasus.pdfIn PDF document text
    • http://chipgene.com/image/files/20210709_121154.pdfIn PDF document text
    • https://asi-filter.pl/files/file/fexefojupasab.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c50b73b28bbf9452e5aba51674ada660/73735173562.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/xemibesotofujo.pdfIn PDF document text
    • http://charivne.info/images/file/48547358338.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ea6f4ac80---jutil.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1760429242---jodabovikat.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6hnme0ikjkjk0r0l32sp62f6h3/67541102404.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/fafavujufotamizatorir.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/88ee59a21e1f233c505d27c0ab32c76f/najewofiwam.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/zizejodedotogijamaxutike.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/42577587104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=go+pro+7+white+user+manualPDF 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_off0000c24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24B 10792 bytes
SHA-256: ad5e1cd8cb3cbb4566f4b33a146a6642ebef60d507a4f77e9fdf6d79e92f8686
font_01_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 17600 bytes
SHA-256: 9a8ed92ddcc27228b11e49e4e05c2bd81174c5b6540ffcbc0eeb3d087fa64afe
font_02_sfnt_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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