Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea0f692efc3fe94…

MALICIOUS

PDF

82.0 KB Created: 2021-06-26 01:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd305e12ddb1a9a60d9ce91123ff75eb SHA-1: 7b0a62afeb5a79619bf72cb5486ea545c00ce9e2 SHA-256: cea0f692efc3fe94d2595432f7dbf41c348e2fcbbf7ada2204bdd3e07f7c9634
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a7f64852d4859c6e3dac19840b890d08/tubamaromane.pdf
    • https://twr1115.net/files/fckeditor/file/vimoroxujusa.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607204f4d3430---79646701604.pdf
    • http://littlepearlbooks.in/data/eimages/file/putinigefebojobitisux.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846aaa9100d---tugupevab.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2e497b83---medozugedekidakifaduz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941ec1414f1---varipuligamomol.pdf
    • http://stihoplet.by/upload/editor/files/82354350429.pdf
    • http://buddhavehicle.com/userfiles/file/suboxixujevof.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a2c1de9ac.pdf
    • http://3suntech.com/UploadFile/file/20210626054602874.pdf
    • http://kawoka.com/userfiles/file/13706250464.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/3233c3e1dd678b33242e2678113889fa/4800610250.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607612b65ab61---93793001931.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160958a1bb2d45---88870884609.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/4dbp0vsg0g7dgd4t7d63rj4fn2/wizalamipajasilaxafepeda.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/06f19fdeca76c065be05230164312a53/dibene.pdf
    • http://changju-hotel.com/CKEdit/upload/files/28180639843.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607056da281bb---fapobotowasope.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf07658335---morelukemufezaririjagewi.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bc98ae58e---77017523283.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0416f521da---97092592862.pdf
    • http://sl-light.ru/design/img/upload/file/lajol.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/hjve1dni8n4nlo82oe6nv1bjo6/53188192712.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082485d3abe0---77266003723.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=marble+arch+horse
    • 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_off0000dbb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 16792 bytes
font_01_sfnt_off0000f3c5.bin
eddbd85890b5ae81dd02fc70d8f65fe09de88eb3a4cd43a651d2e7520ad062c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 18324 bytes
font_02_sfnt_off0001240f.bin
7410461475e5bd067350602b688b0e0d9ddbcae8c7c422f7f2a8e4ea8cfbc738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1240F 10168 bytes

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