Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f742aaaa6c11ea7…

MALICIOUS

PDF

70.9 KB Created: 2021-07-05 15:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d9d13509379fc95e89ddcc5c669cc90 SHA-1: 00bcb5e3d0464b7c157c7b46458c16c35a14fdf9 SHA-256: 6f742aaaa6c11ea7799c8bd4a2df70c14a589e0b813ee0391917a3625cc0d672
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=old+saggy+tit+pictures
    • http://thunderstar.cn/userfiles/file/20210615220855400021134.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/48dff2d21a53d149c1424b2f2ab4c155/85008947690.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/v1v4o3jav8pf9gf4stkcj1plr7/21303303333.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mj76efm2dj9qhuaplmvfoja8cr/80971565039.pdf
    • http://trendybiz.in/usersfiles/file/2951040084.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/74c3f186c9ed5c09d46b7e1629420ae0/xudikexu.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gsilacso1r78nfuujr7lsmhqf4/xulidanikobuwa.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ae059fa9---jivuwafisikanafevexuk.pdf
    • https://easresidence.ro/app/webroot/files/userfiles/files/52230878808.pdf
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/zefawatuxedorimodedotudi.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/e8dl3m1u6ljqbmt528uvk9frf7/32231320168.pdf
    • http://ankurgroups.com/userfiles/file/11369913209.pdf
    • http://alexandraharris.com/clients/36054/File/gufeveweninudewom.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/rejavumiwedexukigadiw.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8309e3ab1---31838092371.pdf
    • http://sp3siemianowice.pl/userFiles/files/89586147826.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160941c9c0c7a5---zeruw.pdf
    • https://szaktel.hu/uploads/file/94332735753.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a746ba7830fb611790ab0bb402821b91/22562740577.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/33a515499fee662f0ea2b13d2bcebac2/45386196707.pdf
    • https://dhesient.com/media/16364383344.pdf
    • https://jackyrouxmethode.com/userfiles/file/34067842875.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/92so06o5v12hde462lllluqmk2/50543415635.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_off0000b5d3.bin
1612c020aefad2ba0138e5005042d4279b98d3714feafc161a08a0396e65c78b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D3 10704 bytes
font_01_sfnt_off0000ce65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 16792 bytes
font_02_sfnt_off0000e677.bin
5252aa6432d004d92a84c1d19b00ba0bc3069ba3fa5207fbcd62de64171411e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 15732 bytes