Malicious PDF — malware analysis report

Static analysis result for SHA-256 de536a1c0ae3281b…

MALICIOUS

PDF

86.5 KB Created: 2021-07-13 17:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 812146fef9dc4ab45dae541f8d6af832 SHA-1: 38f6542a639b764df39020ae7ce80851b667ca79 SHA-256: de536a1c0ae3281beced2a33deb0dd53423e0c3e55578a5ca7cab91fbc4611dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=windows+7+cannot+connect+to+wifi PDF link annotation
    • http://princeworldwide.com/multimedia/userfiles/file/79642133310.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/pll70s1nsl38e1b3o3kjgagu7a/sotuzupojas.pdfIn PDF document text
    • http://staropolski.net/Upload/file/femanujoketererigopun.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160727a8e58580---zefote.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/42018381698.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/kejigizoj.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af50c566ac---88133352470.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-31/20210531033305203308.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074945317743---58462677975.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/rukawawimo.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1620911720.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2d355cf8ba69b478601516aede09d59e/bigurumenexagi.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///ridepume.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/34189636480.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/14445699506.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8vsshhmni9nt06j83a469p2hi7/sexowugikure.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/1519874511.pdfIn PDF document text
    • http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/22147770420.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/26188477727.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/m1oah5291me5vv9j141g43851o/81661634110.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/6d1lnpr0gfqeebd77tgc4gig6i/zalaweda.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/410c7c1ff9dba63a7394e4649ec75c7c/68115116901.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160756cb5c8851---92751131112.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_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 10452 bytes
SHA-256: 2a68e4e6353d41526a2d31d686ddc1984b5da26eb5b962ccacf913556e8ba9f6
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 17236 bytes
SHA-256: 25956be07f00793237244bb801831197892f0e05e0eeac4159e3b9aa3b8143e2
font_02_sfnt_off000134f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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