Malicious PDF — malware analysis report

Static analysis result for SHA-256 808b3721a0977313…

MALICIOUS

PDF

189.3 KB Created: 2021-06-29 13:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e055fd4ecf3de58c3c612019660220de SHA-1: bf574895d7c29b45d828d39a6eed6779fcc985cc SHA-256: 808b3721a0977313524b654c5adf274de981d1bc4178bccfef9c035435d254dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://nomylo.ru/uplcv?utm_term=chop+suey+on+lindell+and+sarah PDF link annotation
    • https://2acontractor.it/images/file/53070025659.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/matomakafulozetewiweni.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a460098d4c---91724499020.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/39716972194.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bi8vmkk9a9lj0le4q2rjkeu88r/savewekur.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae12652ce---86065512225.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/suzuvosamozisavininabuban.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/63b59434950d432dfe77bf90dc9a2a8c/ximafe.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/ziwopiworerupomafofes.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608124881f0db---tedijovanelolofuka.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/67926041860.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ef565b89---wejuwuvodob.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8032e2e798---duteronakisabiliro.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160d68abfd5b2e---zutadavalipotes.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1655f1747---36121135664.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/a9802a3c77b61c24c0022c95aec63d63/12507662305.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/54548719503.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/65443154337.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/82737743840.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa97ad602a---sifitogadixukojes.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6649dee316---46650939267.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/3070154133.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7k5e88gfpt16mqgsjg5ltodkhe/54042303155.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b1076a8f5a5---fupexusesegomiput.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/75052473513.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_off00028c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C0F 16460 bytes
SHA-256: 7aa31d6cccb2c0af1958b0aa231f0da41230e9b08ea7ba3d1db0f4279647f687
font_01_sfnt_off0002b6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002cef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CEF8 10636 bytes
SHA-256: 8b8132f11fe5c61bd072b170aea7079455e3e2f6b46fe872e4bffa89f9a135b4