Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae9f05a5dfbcb7a…

MALICIOUS

PDF

108.3 KB Created: 2021-07-17 00:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cf082d9ee7b3ef3127b12b410045d4d SHA-1: 81ad14ccfdc1e3d6c13ad225ab1c694ef25f4826 SHA-256: 9ae9f05a5dfbcb7ae67b7d854ee63dd88ea029dc903331986476cfd088a860b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on potentially compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://on-video.com/movies/movie_data/file/buwusovojidatun.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/73e36659a793c1587842e4669634277d/wedevisijusemufekeb.pdf
    • http://akcjonariusz.com/UserFiles/file/58714078566.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-21/20210621155612274018.pdf
    • https://chung-pei.com/userfiles/file/1372427123.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d182f852285ea4d6b5651cc4cb553cb1/67264676802.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160da8f9640b5d---rizafuragagakotepi.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c6015e3af---18741875308.pdf
    • https://getadoc.in/ckfinder/userfiles/files/xogebaju.pdf
    • http://derma-dts.de/files/file/36740452424.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7648a1d79---80849183556.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ec3e9d409---84602577221.pdf
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/94549121317.pdf
    • http://kasargod.net/uploads/file/siwedekini.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/6041caf80eeca206976c89734ce2c4d7/94605936084.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0m8oqon2jn509fog41erok9c0/punanuvebogidogolatebewi.pdf
    • http://optykglowacki.pl/obrazki/files/gofusegot.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d70726724---55016602044.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/79u2q4aok7dbdjcqkvfvubsgu0/zexedawasibip.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d885538696d---perenipilinumagowarajeb.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f6d92e0bcfb2f4afef00ffa480e734b2/juxazibose.pdf
    • http://azizolace.cz/images/file/87518870111.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870ff211a90---sikatebepivokalosejon.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=king%27s+college+6th+form
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000143bb.bin
4bd8f9c1957a804c20b060d7757cf44d60cbeba14ef2f94eeffdb39274b3d7e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x143BB 18144 bytes
font_01_sfnt_off00017317.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17317 16792 bytes
font_02_sfnt_off00018b2e.bin
180c4700ffb4755a34e8c04b7ca85c62e57154b11bca8148598451858f6f6e3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B2E 10816 bytes