Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f41559fcb8fa405…

MALICIOUS

PDF

88.8 KB Created: 2021-07-02 05:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df187381819824df576e55cc5587d507 SHA-1: e5991a43e43b526b1596401bf5f3bf557ca00091 SHA-256: 1f41559fcb8fa4053469c2af7a42f65744fb596c4c96aeaba99bbd22a3e065b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ta-taiwan.com/app/webroot/userfiles/files/vobaguzusekawajepibep.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83b58e3b3---80380263622.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2f64dde1---kenuzuga.pdf
    • http://phuocthuan.vn/images/pic/file/mawuniw.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b4456ab83---16422952986.pdf
    • http://tetraeng.it/userfiles/files/85211349728.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/3ft6dubv0j19nb4t0t2h7sumi4/71794222927.pdf
    • https://tramhuonghanoi.vn/upload/files/didutiwuwomimo.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a323dc669f6---sagesekodifasid.pdf
    • http://macphersonproperties.com/clients/876251/File/kunikulaxopiw.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/79r555qib107ibatgpiqu33186/39619869230.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/afe820f9865290e8fada70c3b52889a3/kolametedenevatojonugi.pdf
    • http://motoren-adachi.com/js/upload/files/99125866182.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60038bb7e---takabamubevija.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160996dec13fc1---duwufivogexalax.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/gurulajili.pdf
    • http://vvk-wiedermann.at/userfiles/file/zotudamagesitite.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/7267b732888d1a13f6cb838cd4ef398d/kunume.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160931e23887ea---17728396928.pdf
    • http://ezibra.pl/upload//file/8189278364.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/obu1i1gm4vi78rpkimchet424q/japovewar.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/8ovg5p3s9olq8lcbb7geod4v6f/73156739681.pdf
    • http://vce34.ru/attachments/file/tudazawamo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=low+assistive+technology
    • 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_off0000f91e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 16792 bytes
font_01_sfnt_off00011135.bin
6fc0461ba597fc13ea1f827d61dde948848194b3b2b75a368320a272b6c186ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 10632 bytes
font_02_sfnt_off00012994.bin
033c800092a021caa77d7c235a36f639e955bac6debb82c7e6599b5733beb045
pdf-font-stream PDF embedded font (sfnt) at offset 0x12994 16544 bytes