Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd760f7d285e0a04…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 20:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8fe004d55b033050de005d2613da11fd SHA-1: d49f34d1ccb59639041aa9590c7bdceb10d2f357 SHA-256: cd760f7d285e0a041c760beaf155106414b036a18f04969ec6096c41b6ee0e0b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. The ML classifier strongly indicates malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://pixomot.ru/uplcv?utm_term=how+to+rotate+all+pages+in+pdf+preview PDF link annotation
    • https://classykitchen.pl/web/uploads/files/vewed.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/tifomul.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/58214231705.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/dovovujebonajotejot.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308197c9801---90312718656.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/dekupolopaw.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/fimisazunajerigi.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210923/16323450011540.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/34263673977.pdfIn PDF document text
    • http://santeh.md/img/files/33211196361.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/pefafogatanelopoted.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/verotu.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/ripepitizugu.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/89525850304.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/25953777979.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/16303442126.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6df6dcbef05ef3d50afd3b2718194baf/xelusagolalonogaf.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/noburitikulip.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/bufopajefonefogedesi.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/putirig.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a53cce9e2---86537742915.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/pases.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e62e1f8b7---javolebufokinoputoliwopaj.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/vorobuvomegalozadojiwuma.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/pogowenamewi.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/31731075224.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210906031950212491lv2w6g4l1n4l.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_off0000b402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB402 15872 bytes
SHA-256: e6894924aa7bbeb19f8401cd6d29aadad1c1ec45ce752ac872608460d93c10ad
font_01_sfnt_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 10816 bytes
SHA-256: 335c2919a33d9f0dd4706094a9ee080d68403c491bf5802f4bfb69d642ff2ebd
font_02_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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