Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ed4b25dfea41dd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 20:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 004eb66ef3d21ca10479f645ee3f2804 SHA-1: 174af1f8c9cc41c9c848862da688b564971fc582 SHA-256: 41ed4b25dfea41dd75248d3b918f9c3e36a2c77136d19762fd446b0dd40d3913
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=forgot+pin+code+on+android PDF link annotation
    • https://gesema.com/UserFiles/file/60635251910.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/15a283b3393d962b88b4641723b914cb/51167446158.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/84836990976.pdfIn PDF document text
    • http://cga82.com/admin/File/bizujafunalubawezarejuse.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f274a15561---vusuwoxugetupodixaf.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1bdbc28188ff85bd4b975897d152481e/60951255206.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a131cfb21---basipijemenujepusoxin.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/letotazeratazazefasoz.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/bugamap.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/65874004575.pdfIn PDF document text
    • https://kham.vn/userfiles/file/1255958654.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/10836670570.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/98966561564.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/10845273831.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/mujilimu.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/56334626942.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/kiwuwope.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/fowupegadilevajenonawute.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/31968782048.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/wumugaxoxuvepuzozibatanuw.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/83666563680.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/togim.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f729db5fc7---1507393547.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdf9083571---vuwakotebubuxoraworirolis.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_off0000d611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 10452 bytes
SHA-256: 973a7176bed0737c95d288888459e530f3f4a783a47f544a4f0755da117adbc6
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 18008 bytes
SHA-256: d628ff0b4f0886e565fa6dea5387a5e052784418fba2f29a2903daf4baa09faa
font_02_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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