Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2161796b67b49e…

MALICIOUS

PDF

73.9 KB Created: 2021-07-08 10:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6cc3a040d091bbdecb04e81ac1a5b690 SHA-1: 5a4e0ceb5c3a812d1b1122abf6b62e8804b5262a SHA-256: 5f2161796b67b49e534562b7d30878c1c770cbd2787c20ed5386b55cdcd72a81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

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 https://allytemp.ru/uplcv?utm_term=accounting+test+banks+and+solution+manuals PDF link annotation
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/t1422ceir2n442553ou87joqsg/kopis.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9bd4a19a9c6e2c1e91e88dd7d6e8570b/54282647979.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///porujafitodiwelijamib.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/vexax.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d8f05a5e7---68099335681.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/mawepiwonidejemo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/uimcrf4540fi3tfn6knlamg8t0/gedesegik.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b6dcaed0ee6678c7ccc768b38dbf60e0/zapofurexuxaf.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/23571688846.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/42961891659.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210618_173425.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/317352358eca227fce85d7088146071b/45711856187.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/31474225498.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/bekabarobuzixe.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/wikavaxa.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3qnda20ko2f9dt2jfcupn40sq2/doletiwogaxa.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb886ddc4---23974836186.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/97bc35eeba089fea20d17cf0cb83c155/3109225616.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/19366fa8e48b85f128ffc0a26280d02f/8293461465.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/fixaxogerunetij.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e40a7348996---13120833351.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45aa714df1---bilobanizepeb.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021070314155770554.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA6 16564 bytes
SHA-256: c1c294a29a22ac76df02836a6ee4afcf6ffec6fd8acd9aaf6f9a8969ca6b184f
font_01_sfnt_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 10928 bytes
SHA-256: 0131bc13ef4b533f85d2ecc6773b13ed81498d76b6d8b4afd4cc4da835d1962f

Open this report in the interactive analyzer, or submit your own file for analysis.