Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba622a2d1841d95…

MALICIOUS

PDF

81.2 KB Created: 2021-07-03 04:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 993a7eab59161fed6e889ced956a0041 SHA-1: ed5a99f0eae9bdba772b8746daba9b0a5c8d4387 SHA-256: 0ba622a2d1841d9557d0a262ae769d54ff84374aba4456ef9066e93958a87bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories and exhibiting characteristics of a link farm designed for SEO poisoning. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the URL structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160873d2d84ddc---46723858369.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/refagu.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e10f4c5bba565ebad8b16fc0165cf9d2/mesupovijederawa.pdf
    • https://bczenekar.hu/files/file/kotovebuben.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/2c3aca7af28df71f7c492134331050b6/9561203420.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc1b6f27b---59912343050.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210607082335.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c407d549d---51134713011.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd83abe229d---53741189879.pdf
    • http://ahchala.com/img/file/kigeloxatotodesupanosaxe.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ddb5e751---zukibisenipaverura.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/07f67882bff15d0bed6e6cbda45d38e9/40330654270.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/4b1f0b1d89712e7bde01f1f26fe4e5ce/76010050160.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc7a026e96---govewulomopulub.pdf
    • http://tamker.hu/userfiles/file/11215860087.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/19845177888.pdf
    • https://landbondcorten.com/attachment/file/3fc1785fd86b3c13b55c902ac6755cc1.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca303c5677b---sufogugeruzabosotu.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609993960d725---lakufavemiwixow.pdf
    • http://kasystemofkarate.com/clients/861259/File/49174294757.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b919bbeb428---53447373265.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5e611fd6b---valenu.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c010855fdbd---83298919202.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4962b1dee0---94510408821.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ej90cg6r67h3vmgj7hlkrkh0h4/nozuw.pdf
    • https://agatanorek.com/files/file/fafigan.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+sum+of+two+natural+number+is+8+and+their+product+is+15+find+the+number
    • 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_off0000d864.bin
a79cd5f883f7b3c84d09167ffafae542074cbd4645064a5d689aed173be869bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 11568 bytes
font_01_sfnt_off0000f394.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 16792 bytes
font_02_sfnt_off00010ba6.bin
a6cf7cb8b12dfc074a3e3d62bbb82382ebb6edaad54ce9fb81dd329a6065d8a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 16608 bytes