Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fe64ce9157cf82…

MALICIOUS

PDF

207.7 KB Created: 2021-06-25 19:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76fd5bfef3b4d2fec76105af756a0f24 SHA-1: 36cc6dad5ac288f508409485b2ae34c7f8b2b592 SHA-256: 53fe64ce9157cf82bb4240b4a77e6d83cd5756f4782c76449d7d25640b3dd628
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF that contains links to external resources, many of which are hosted on compromised WordPress sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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 http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h53r9h53e3l3qhh8723reco6o5/bowupe.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/aqb1kmt2asgk1dk1q0tck2s5he/1431865366.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/49695541239.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ibhajo7bsud3o1qbv6j229khb4/vebunalib.pdf
    • http://bidwoodmachine.com/d/files/vaferelofizitagoladaj.pdf
    • https://agrimal.pl/userfiles/file/22799489988.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160879b760eaf0---xasusoziletog.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ecdf7ed4f---zigakupetewudajipejodogo.pdf
    • https://condicionamentofisico.com/arquivos/file/17739330109.pdf
    • http://ttccid.com/userfiles/file/25032649205.pdf
    • http://sosnovgeo.ru/userfiles/file/sowepaxekedesolut.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/1k01l6tjpl5fs044gkpum498s6/79202837098.pdf
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/44087210706.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b311e5454---30999460810.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5f09de2dbe09adb160a2b4e8ac5b23e3/vixir.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/711250f354f3d962d145644433c790f7/54136896531.pdf
    • http://kartywspomnien.pl/uploads/assets/file/pesiridonibizotur.pdf
    • https://heatingboiler.ca/fck_upload/file/98773699850.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7332f29c---48557232356.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8285a1ae2e1e5aeda2c751fe83d37d21/kimid.pdf
    • http://apsara.ru/userfiles/file/7397250908.pdf
    • http://alnadaoil.com/userfiles/file/meworapobeduxukad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=an+example+of+self+determination
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002d26e.bin
11266455498613fd1714a199078f58ab4a11264ad470fadddbe6db6749b70e9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x2D26E 17884 bytes
font_01_sfnt_off0003002c.bin
98f80687d23d4f8855f730517d5d128169a0629fef2d3cec017940e6c1c6a3d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x3002C 10740 bytes
font_02_sfnt_off000318dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x318DC 16792 bytes