Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef2121e4fee4dbd…

MALICIOUS

PDF

89.3 KB Created: 2021-09-19 11:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7140edeb7749ee75f94dabad1f1e10a3 SHA-1: 2f11b5aca6604968d8099a92e83c4c25795cdf70 SHA-256: 7ef2121e4fee4dbdd6dcafd059e1177d8a31a0f20578f4fe20c248943130f571
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to download a malicious file. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=smartphone+economici+android+4
    • https://3rproject.eu/ckfinder/userfiles/files/boloxaxolaxijuvenatada.pdf
    • http://archissimo.eu/userfiles/files/99438528219.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/25561551907.pdf
    • http://grupposcorcia.it/userfiles/files/nubulosukerux.pdf
    • http://jgweld18.com/UploadFile/file/20210904024850247.pdf
    • http://khachsanmyngoc.com/upload/files/pamodurafaxonad.pdf
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/10679097566.pdf
    • http://aedelsur.com/contenido/files/fowabaw.pdf
    • https://aep-tc.com/cache/fck_files/file/kujemakigunu.pdf
    • https://wolfgang-photography.com/userfiles/files/rexezimusejedawolerise.pdf
    • https://glearningsolutions.com/userfiles/files/17558365859.pdf
    • http://bkht.vn/userfiles/file/66637417008.pdf
    • http://asfalon.com/__files/file/xekavupenosipipugarata.pdf
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/75954780405.pdf
    • https://abcoegypt.com/userfiles/files/3870874993.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140773de2859---35855200717.pdf
    • https://ccaquebec.com/userupload/files/18637563860.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/77ad0b3419716e1edae38525c65c3d1a/vikojebumajijuzugizaxemir.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6771bec9a67a8cb7fff12d872b716580/18067154216.pdf
    • http://tokyoto.pl/UserFiles/file/35090600839.pdf
    • http://carmakers.cz/userfiles/files/98923244366.pdf
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/sifomakuna.pdf
    • http://wohingltd.com/userfiles/migunozoxavisib.pdf
    • http://j-club.eu/userfiles/file/97105646818.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/23497976907.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_off0000f527.bin
dd9b972e525ff28add3e9381fff1624960c02c54596204477ca575228780c3af
pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 10720 bytes
font_01_sfnt_off00010d96.bin
ee7ab8780e34b69450986c21a62712cfb8cf42ae39cc177a853a9840eef3575d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 19188 bytes
font_02_sfnt_off00013fa0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA0 16792 bytes