Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbbf744d1f7eb22…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 11:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2ae28842f4b298f8698d340a570824b SHA-1: 32a9ed3e9c21efcad23751b3b48487fcc9e3d228 SHA-256: 3cbbf744d1f7eb2272f906f7931674f33bd0717783e88693e66a397dba406e31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://saraiaser.nl/userfiles/file/wozusivilavuxorujijasiwa.pdf
    • https://alexandrapanayotou.com/web/images/static/file/57991689856.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc6437163---38240456979.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c752becf8eb---9556235970.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce8f7ac4f2---rorutasavasas.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/jowutuku.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a240c6070b1---37758305528.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609445af54a95---fenezaduxuxovovovi.pdf
    • http://z-i-f.ru/userfiles/file/gunaduzamawuzafowakixar.pdf
    • http://el-master.ru/userfiles/file/fuvibonigusoxefewal.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c6cb233b7fedcffe46231d7ae0bdbb26/womilepaxezidulo.pdf
    • https://www.dars.bg/ckfinder/userfiles/files/29790409971.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b839e6aeb8d---nulilobima.pdf
    • https://megatekspb.ru/sites/default/files/uploads/tafibituwojifuxujogoxim.pdf
    • http://standardamulet.com/files/files/46686394268.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1042f08417---303820442.pdf
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/gubefeza.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ac4723a1e704fed1d9172b7ec4f80da/magutosageja.pdf
    • http://rm-centr.ru/uploads/file/mopesovobamik.pdf
    • http://daeryuhealthcare.com/ckupload/files/66694111026.pdf
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/jilugamekutenutabesox.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1827f08a---7149510575.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84872972686.pdf
    • https://kentacademymiango.com/userfiles/file/75150911702.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/1c6cvcd9js351ccdipj2ri54jc/56528296749.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=inventory+control+system+case+study+pdf
    • 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_off0000dc2c.bin
4cadfa153dd1cf4bf6fa361a6877c3f2aae5d57ecfd740def5e050d2f54e66ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 17276 bytes
font_01_sfnt_off000107d9.bin
e1b5f24e64656c54f02939c7068139db679624b24331608ff537b8a0067ec29d
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 10920 bytes
font_02_sfnt_off0001213c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1213C 16792 bytes