Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef527d33f346fda…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 02:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9da17b7d20aea52371c129da8e01a12e SHA-1: 80d0dedf1475ced5b1114836eec8ad8346f4a765 SHA-256: 1ef527d33f346fda93515d33a4fecd42c50b8bd94ea2e311bd8a33d059d9e3c5
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 are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=a+quiet+place+2+free+full+movie+online PDF link annotation
    • http://brickchamber.com/ckfinder/userfiles/files/minubu.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/13522361082.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ludusurapin.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/uqovfqdmsg2ejvu3jh3cco8a49/lasikemavexodiko.pdfIn PDF document text
    • http://js-space.de/userfiles/file/4610629850.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/93006853574.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/fezotuvavefim.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/feveramemewu.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/21057691665.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e294fa2a6f20df30a7c68f9a2da2c869/3569034192.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/44629015812.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/32407091413.pdfIn PDF document text
    • http://runo34.ru/attachments/file/tuxatulajodowaxa.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613411361d59e---61455354999.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/lobax.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6919aef57---61299876335.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/limamabigesiverawaz.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210906_CB1D7AD68B796E31.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614076104ec5f---98852436838.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6fe2b01e---muxumedewilepixozu.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/86360592675.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/teberikit.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/d0fh8tjgmckfn3hvkkt5ft4jf0/zubazemo.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/95338591633.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_off0000b4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E2 10884 bytes
SHA-256: adb209fadcab5f7b47c16331c7b42cb8b59d5123f6b8a434e2bd244a65c79270
font_01_sfnt_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 16148 bytes
SHA-256: 8d68b12c71d6c16344fc9d31c279f185a35cb6b004f425787fd80984f4ac5318
font_02_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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