Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f4fb7e52cea628…

MALICIOUS

PDF

75.5 KB Created: 2021-07-06 20:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 52b034e57b16901b37e3906a2f0f0c38 SHA-1: 585a915e1560f31b67c2fcc344cd072835cdfe6a SHA-256: 33f4fb7e52cea6280330793a3773a2259147c908e8aa320f2424c83500fbca58
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. These links are likely intended to redirect users to malicious content or download further payloads. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=biology+class+10+notes+pdf PDF link annotation
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1fd600c6d9dc94b937ad3ade379478da/tejojo.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/sopobixamoxokirufuxu.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae55e90048c---54939227645.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea1be21c6d---xiregutaliruzifi.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/jipizaxa.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160877700c431e---darobuzuvugixuragifisu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/4d0623fmodbp60chgauh8dq9mc/retarajujovunozeguxezak.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/34258457012.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16097f6f179f96---puludilufajifivi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2dcd88ba7---firinakolaxokapeto.pdfIn PDF document text
    • https://soechi.id/userfiles/file/8740808557.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/7681487930.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/616af93e65ede03013325ded106e79d8/4031740211.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44fb42ba86---93113276108.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7gtar2au33nvjpt1s0j0s94ar7/pemirunobobuvufa.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3729651801056f754a668a0a3d2057e1/33452290308.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/bj8iekr50um5jr7fksr49bhece/63967857788.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/624d3747e7199bd5be9c183aa6d9dd22/37396118929.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf950a3abf0---95995365279.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rsgju9o2u77fumbn4dvrd4hid2/mupemuxubedemuwirajiv.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e5eed8aaf94e365c320737b95956cf7b/66183207209.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f67efeaa---93272738642.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/da8c512d4b45d2e5722846eda322a712/55496541585.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/rights/Referenced by PDF JavaScript
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 16016 bytes
SHA-256: fce58ef0c0cb98c66180892eed95411c54602263c2e3c0bec3a8299ea702b9ac
font_02_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 11036 bytes
SHA-256: ac4326b991bc4c5071e492afb772aebd6cb4ff1985b00ef773cb47d1222eb108

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