Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba33b4e6d5d60a8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 21:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57085e749874ac7724e7a3b12c0cead1 SHA-1: 10402f4c0b8096ff8d68b7f07a95532564910748 SHA-256: 7ba33b4e6d5d60a83aaff186ca8996b1987b98b04bf16505d157ae5fcab5662a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

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 http://swaving-stalinrichting.nl/ckfinder/userfiles/files/sawapiwof.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5a243698---porosuzupimetubugat.pdf
    • http://toptoptraining.ru/img/upload/file/bamadajikales.pdf
    • https://giaiphapthietke.vn/media/file/files/8334613181.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089559336a67---tixarov.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd393a129e0---26653012736.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/079b3700a70d8ffa9b2822574cd1df00/37371822533.pdf
    • http://cmtsport.com/pliki/dusunisukuzomo.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/35988c54726551afd52055ffa68aa2a9/32663165602.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/bgv87eegbmd3q1f4sbjfq51be2/ridelerimonofezogegiw.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/84962744140.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/3c9f5e7052388c6e2e274d8f7d0f3fce/nitiloxexoposumosedipamo.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2717486f6---wufikoxanixusukenosimed.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0ae6dcf1---96454808169.pdf
    • https://birsamundapark.in/userfiles/files/kadixexivazumebuvajera.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/22ec4f8784db33f245d5f7e23e642c0f/7064749263.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/411833ba1eb0c870ced4473ef62a507d/12110355138.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043df1e2002---fuxovili.pdf
    • http://www.web-globus.de/ckfinder/userfiles/files/80304854795.pdf
    • http://archi1919.com/smlclub-files/file/44097293867.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/87360684609.pdf
    • https://cplastik.cz/data/cms/file/rejutonumokiremogulir.pdf
    • http://www.brickchamber.com/ckfinder/userfiles/files/69096615845.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=el+decimo+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_off0000b3b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B1 16792 bytes
font_01_sfnt_off0000cbc8.bin
db944325f7efc3b325e889a25aaca155d503e8bfe748b7469ce6732fefca3989
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC8 10132 bytes
font_02_sfnt_off0000e243.bin
2d1eea5dcc3e4729e06002ad8d2179ed5ba7353606ae5db28976ee559748108d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 17320 bytes