Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e5aa5df034f5b7…

MALICIOUS

PDF

95.4 KB Created: 2021-09-21 00:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69c94e12dc834b3a166586c3a9247567 SHA-1: 61f74b6b35c0e52100e08adc5cf528042bccf78e SHA-256: 32e5aa5df034f5b7ce82d67b250bd5e85704f33150ac57dc0faed5999b0c6da7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified the PDF as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to be directly executable, but their association with compromised sites and link farms is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://tabletopad.com/images/file/93221182390.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c0f1d8dc1---7129640344.pdf
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/zalakilavifuxado.pdf
    • http://totoumi.jp/upload/file/50544183488.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912863bcac---92819136170.pdf
    • https://bselink.com/userfiles/file/69508851621.pdf
    • http://medica-eg.com/userfiles/file/93966856349.pdf
    • http://www.luna1956.com/images/library/File/30096485051.pdf
    • https://galaxy-training.com/userfiles/file/35540829560.pdf
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/mafobetuforakusesiti.pdf
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/53051677851.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/68548002381.pdf
    • http://czechnews.cz/userfiles/files/90997196460.pdf
    • http://nessium.fr/userfiles/file/tegogutujewusabanebulega.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e8dfba606bd038c348b8a143be189f77/34991509716.pdf
    • http://budka39.ru/files/dajobofebovupifa.pdf
    • https://superpackeg.com/userfiles/file/3696869502.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161360450119b3---88114035582.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161326328ce555---13487604440.pdf
    • http://spostojow.pl/userfiles/file/52660794519.pdf
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lemesemolavepu.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a97f8aef93c715cb0f213f8583f45036/99920025380.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/nugokizezuva.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=english+grammar+for+ielts+pdf
    • 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_off00010dfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 16792 bytes
font_01_sfnt_off00012612.bin
07c3506bd9497698e1e265e6bd6f95f079de0fbeef8b9777efb50db6a7908965
pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 10928 bytes
font_02_sfnt_off00013eea.bin
d9751fbdd2f7e7f4e4a3df0cc55fe5bd4b5d74fb38e4a7e22d412662efa3d457
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEA 18948 bytes