Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1426659663ecd0c…

MALICIOUS

PDF

85.9 KB Created: 2021-08-14 09:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdaf197b2b65b6ef00e0e0bcbdf544fd SHA-1: 8fb398062dccd9ee7588561fb67422849952f437 SHA-256: b1426659663ecd0c332151f2c82ae2bc2434a47c168a9183558a627f62de4dd8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79884a015---gatemumebowe.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/nunewuxi.pdf
    • http://ffarchitettura.it/userfiles/files/wufulezerifan.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/llh9m6t3tfvsu4meffovuj9la3/85113752068.pdf
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/kebol.pdf
    • https://cubic.is/userfiles/file/jilupiwaxamikuf.pdf
    • http://bahattinburyan.com/userfiles/file/45069246770.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0775e7a35a---zalin.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/63392363497.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8395ad4b9---zodemolebutumorazepupek.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe758cb32c---32778463020.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/bv6il98ipitv5alq916umav3h6/67467732760.pdf
    • https://fokusmedia.com/images/uploads/kagulonafibi.pdf
    • https://cplastik.cz/data/cms/file/xefiguz.pdf
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/8210034407.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/13dfk2tnqpc963gnd8ic77sger/tawate.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/gvni6pl01esugum5ho8u03kvc1/lutatekawiw.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecace12f575---relusumijuno.pdf
    • http://dakmoto.cz/obrazky/file/pamaluwez.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d637827e1e---39110374160.pdf
    • http://kino-cosmic.ru/sadm_files/82331376987.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609210b9c0e37---kidatawusipodejojuxeset.pdf
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/bagopilu.pdf
    • http://castudio.eu/userfiles/files/75164334167.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=zimsec+o+level+mathematics+questions+and+answers+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_off0000e971.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 16792 bytes
font_01_sfnt_off00010183.bin
63acb9756507e6b881ea1ff3bd4f7c83530074821f8954e04b648a668bf43ff2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 17164 bytes
font_02_sfnt_off00012e3c.bin
24bc87574c62c98dbc9932a4e61c372606e0707289f6782ea04220c03ec80d70
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3C 11248 bytes