Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c82e3314f0d9a0…

MALICIOUS

PDF

88.2 KB Created: 2021-07-27 07:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5b80533da00f35dae8c2d63481e16efe SHA-1: 7740cbb678a3a3432f04992da311e4067d81b77e SHA-256: 50c82e3314f0d9a0acaf27b5058a1c6a30204e66fae5e51b0abeb47712531873
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, consistent with a phishing or malware distribution campaign. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://theurbanthinktank.com/files/93772704363.pdf In PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/61caab62e144af817a9d59b97c1de222/bilazevanujodaxuri.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/32083149480.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/vusuvum.pdfIn PDF document text
    • http://abpaluso.com/upload/file/defod.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/33565882882.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b78c90f94cbd501caa5b82c1145ddd84/78115359796.pdfIn PDF document text
    • http://evola.it/userfiles/files/kumepopifazix.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/76965779059.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/raderapije.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/tekeboto.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1eaf76d34642f3f7df08d48d46d8b4cc/55376642938.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e0c05f758bb3419397de8249244bbf13/temubuxipagumawix.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/7558759802.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/83957245858.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160911a405a996---kerewepikamexajanodara.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/888479082d32c563f4b9496d4347490a/47741603310.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/wotisawatevudebesazima.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/januji.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/nezanapisuxizitumotoka.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/d03c996bdfc4ef50c5caf80efc2c90d0/begenurefakiporotogaj.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/78527351283.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/105b45cffcefdbbee898ed777d58f83f/26696045620.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cce6d9e36---31180020113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+remove+control+lock+on+kenmore+elite+dryerPDF link annotation
    • 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_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 18268 bytes
SHA-256: f606b3ff1be35eea573c63ebe02d2cc17bf87128af3c930d667517c40bffbb6f
font_01_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 10548 bytes
SHA-256: 41115b43e6a54cdbae6b3b76c4a5cdd89899713aeb042ad3502b09020a3635da
font_02_sfnt_off000139ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1