Malicious PDF — malware analysis report

Static analysis result for SHA-256 4091b6e5c922a7ad…

MALICIOUS

PDF

94.8 KB Created: 2021-06-26 23:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c66f690a1b4cf5cd76f54794db1dfd72 SHA-1: cc696c92dbfaf7925be0d893aea3daf4c3f6a9cd SHA-256: 4091b6e5c922a7adeac65c470b1de8e6d566639dc400996a25d5367d1ed56d5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://communeouchamps.fr/userfiles/file/nonezusiponebiveva.pdf
    • http://jjinline.org/file_upload/file/runalerot.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc4f0c7536---64547219167.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/583f56e7f71053bb50007a9e7b88b158/misofevanososiwuxubovum.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6dc5781c6256447bf49d4312e7e931e5/15570078729.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d32c23e3---bizewinijofusovugojexorex.pdf
    • http://www.derbysignandgraphics.com/uploads/file/5943023889.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160984b706e337---nebuve.pdf
    • https://carrieres-pierre.com/userfiles/file/runigevamumuwebumodeji.pdf
    • http://autowagon.it/userfiles/files/1538011734.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/2b1aa8fddc41571f18ac64df4b6c0f24/zokupokosibu.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b41ccc106---6871187156.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609988cd70a14---88225670846.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/xopelokil.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/66028b6f6589560702c6f736c7904ebf/tisuxapepeginun.pdf
    • http://benthanhsgfarm.net/images/uploads/files/32764407322.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c706a0edfd1---naruvaturolekusekegubonus.pdf
    • http://timnhanhonline.com/upload/files/12963360006.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/34230114149.pdf
    • http://budohurtsa.pl/userfiles/file/28033589020.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095228a975b3---xijid.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f7867532---lodubom.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/c79debd9e577a5de2221191f004d3af6/72351214144.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ca9b66ae2552ea7b28a9f14ca3a4f4c5/10501369181.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fptf9ra94o5pia6o5c5hrj7jji/80156281527.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/985454059e126934a0bd4fa2a3141d69/10043777329.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf287bf34---jomewobamegisozeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=an+open+day+ielts+reading+answers
    • 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_off00010d51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 16792 bytes
font_01_sfnt_off00012568.bin
146479c734ace57436c117b5fa30a00976b8fa69a6d28365a2e00da7f7dad23c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12568 10748 bytes
font_02_sfnt_off00013e23.bin
3985ea4d32e7ff95011059925234f06cdae3f519145ed8698415c59d5a994f15
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E23 17728 bytes