Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae1932df34152bf…

MALICIOUS

PDF

78.0 KB Created: 2021-09-10 17:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e01a9fe3769b68410a74a6b0389a785e SHA-1: eac92e7be97fa7882646b4ebc2c7d373ca638ce2 SHA-256: 8ae1932df34152bf40eb1bc8847dd628b1b729ed728ce1fdb0b9be0e7e8e60f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://js-space.de/userfiles/file/wafenunego.pdf
    • http://ogcdc.org/uploads/ck_upload/files/fukugawexodexumaxekejifip.pdf
    • http://thegoshow.net/userfiles/file/zurulonivixabuwur.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390108db059---91309504048.pdf
    • https://itexpertdog.com/upload/files/japofad.pdf
    • http://bitite.lv/media/txt/122/file/zezexusabozotujajudibatu.pdf
    • http://trust-law-firm.com/userfiles/file/20210901111637_1592431758.pdf
    • https://onlinendttraining.net/files/87367136940.pdf
    • https://quizai.com/uploads/files/27551787638.pdf
    • http://omonetach.pl/foto/ilustracje/file/belenanaseponasokejiw.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613937ded0d29---97766026478.pdf
    • https://sagarexpress.com/userfiles/file/legewoxibutefukilenulude.pdf
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/97986750495.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/67118536851.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/feac9014b303867eedb2827b79a0b044/23117038502.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/bamuziwuti.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/60267916120.pdf
    • http://cppzone.ru/users/blogs/file/59798560163.pdf
    • https://mimpishio2.com/contents/files/kusudebalej.pdf
    • http://dd-eng.com/files/files/854854770.pdf
    • http://epodhajska.eu/UserFiles/File/nitiritomebaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=counter+terrorist+mod+apk
    • 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_off0000cb37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 16792 bytes
font_01_sfnt_off0000e349.bin
efbb1f3c187a59ed9051f174adacd2310c39a7f7ff54f08aac20720a196368f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 18016 bytes
font_02_sfnt_off00011278.bin
d327d1771bb12c7f80a18ee61f4bea1d6291486347b5d5fb4ddadd90269f8300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 10732 bytes

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