Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc96d0bb4b752cb…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 12:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49782b1f0bc0fef0d2cec5107812070b SHA-1: ad9d341b4e91e2ecb8c1cc20f62abf9f5282563c SHA-256: bbc96d0bb4b752cbdb7e0284442b534a740ca7160b9490671cc66ca0dec86cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://laborke.ru/uplcv?utm_term=webstagram+instagram+web+viewer PDF link annotation
    • http://uniondrygoods.com/fckeditor/userfiles/file/23678334254.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210918_050822.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/78817831424.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/47168111093.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/jafik.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/35698388151.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecc10527bf---56719110357.pdfIn PDF document text
    • http://vina2002.com/uploads/files/jawav.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/30405935699.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/tekatuvosusarebo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7fcc139b22b433ff69d3e5762f364502/dovomejajekiredib.pdfIn PDF document text
    • http://checopharma.com/upload/files/67636725194.pdfIn PDF document text
    • http://trubaopt.ru/content/file/xoletelejozeredevano.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/ruzibopisi.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/mipejegujituxasidejeso.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/xegivajitapadaguwej.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/buterutejofukidoliligew.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/87114575211.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fdcb18e1b---pakudilozajizipasepum.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d2608bb30b8af2fec135d7439eca08ff/26385222868.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/senakewaxoper.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_45296F83B0983BAB.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/20279201598.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/26847494779.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/71640999969.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_off0000b536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB536 10568 bytes
SHA-256: c1b4b2e1dd5d228f99ea5985b59d57e83b1edbb128774930820a4b373f4b4b81
font_01_sfnt_off0000cd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 17096 bytes
SHA-256: a3758fc6262d6adb6ba82ff42ad239f1c9abda9a7fa73e2020158b10fa171548

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