Malicious PDF — malware analysis report

Static analysis result for SHA-256 9800676b2e8c2504…

MALICIOUS

PDF

91.7 KB Created: 2021-07-06 07:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac383b4907dca6a92ef559d5108be63b SHA-1: fab73a5a08e65c76b59d562ba98b3e21838d4759 SHA-256: 9800676b2e8c2504aff199b1e4f626a4e2ebe9d705bc770b5c65789aef2b98c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zxsolar.com/d/files/tifukileravovirowinobivef.pdf
    • https://turkuazhost.com/calisma2/files/uploads/3615538032.pdf
    • http://etcad.net/np/upfile/file/mefojenuxikepap.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69eaab9552---depapam.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071f7af1fd7e---57787695994.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160da75fbaf443---tukakolawisixolugozif.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/b6c6078570a4cb979f35c1a514f22245/28493732466.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/54d370b77bc1b5ab5afac69966e8eca9/38235625185.pdf
    • http://bnblspecialities.com/userfiles/files/70932323927.pdf
    • http://lycee-elm.org/userfiles/file/10829368963.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/33233a0f024b5406ac59f969d846befc/refiveranotutomupit.pdf
    • https://baxsporthorses.com/userfiles/file/76301738032.pdf
    • http://soft-pro.hr/upload/datoteke/nosogarojixatefutifi.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47e84eb225---xonuxirurapeve.pdf
    • http://veribase.com/E/file/33195042584.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/femilobanutum.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086acad78081---bijosakanobozorufa.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/cbepqgtbqmj5mpbftbtvsjoa7d/dutojulo.pdf
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/sagisalekujogaj.pdf
    • https://umartravel.com/files/boboxodijodofeponuweni.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/tuwugukirewureda.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad8e325af---16483792810.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e7957e9bc7f6fd09480b4b37f9faa42a/ketaso.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bruised+knee+cap+from+a+fall
    • 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_off0001033a.bin
c20eaf1ba2974561956a42ee463a3062ed97a0e471ed8d6789f32707902ebb61
pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 10928 bytes
font_01_sfnt_off00011c85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 16792 bytes
font_02_sfnt_off00013497.bin
65ad9feb534abd8fbd41dc6126b5e067f4cae4ee6c84582d7afad820f97ece96
pdf-font-stream PDF embedded font (sfnt) at offset 0x13497 17224 bytes