Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e91597d2c998aa2…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 16:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f751edb31d25f3669484d74d159ab40b SHA-1: a633a86565418fc2d65897301b1647104f18b28b SHA-256: 2e91597d2c998aa25da4aa6d240a71170e747b9f9441ac5a06e0be578a482bb8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a common pattern of using embedded links to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=pokemon+sword+and+shield+gba+english+version PDF link annotation
    • https://www.fangjin.org/ckfinder/userfiles/files/541325348.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210912150819.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/24672925333.pdfIn PDF document text
    • http://retrofotr.cz/files/file/44334230921.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/24503816876.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/67487561998.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/jimitefot.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/20586080952.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/fezotov.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/nigamusivenusowal.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/12752641549.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/xuwiredotakafadusetadat.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/42349731893.pdfIn PDF document text
    • http://hak-al.com/resimler/files/solujelekegebikozosafeti.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/ronoli.pdfIn PDF document text
    • https://digiconelectronics.com/media/nuwulefudalufexowuziseba.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132434e56e5c---ziwiguramezuxinijik.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/89421290439.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/98140413351.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/sifiv.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/logokavafelewajulemulev.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614084e5b8394---bokewub.pdfIn PDF document text
    • https://km2804.com/ckupload/files/nijawijizefusitukewo.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/fefidi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/31jonc6ig0hs0r78atrd9704jb/55515148097.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_off0000c281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 10980 bytes
SHA-256: 9c1658286f7f79b302cdc006422c0f3f4c3f8f4e4b7b321fd9c7e487df64e724
font_02_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 20344 bytes
SHA-256: 139084af3de65bc34946fa39553b97ee7d8fdbc0e02da57c553bafa697b773c4

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