Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4416b22059d9ddc…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 23:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33e4f842959870aba0a1d42800d75ebe SHA-1: 14cbb31c3d1456c60748865f9491b926c3da38a8 SHA-256: f4416b22059d9ddc7ab1120695c6133d5381d5bf3573a77ca4c776412bc6dc7b
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links to PDF files on various domains suggests an attempt to lure users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://zzzwchem.com/upload/files/xorizagokore.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/lubufubesuf.pdf
    • http://srtcivilnorth.com/ckeditor_file/files/simurib.pdf
    • https://bcm.es/files/galeria/files/zifekafejewuloguzizujafif.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5bb4ad749---tikumitowijufe.pdf
    • https://weeb.nu/userfiles/file/kuzonepirijupowufazet.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312216b4323---vapixujaribat.pdf
    • http://czminghe.com/upload/files/watumeretadore.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614639f5113ea---57626884416.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c9ab095a4---11391045609.pdf
    • https://zahidnawaz.com/UploadedImages/image/33539602980.pdf
    • http://dzstock.com/Upfiles/file/gilowarepevomukevipa.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/nozifiwuxuk.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9a267011ac3d7630e6c8cbe72ce85429/64118371688.pdf
    • http://vnationwide.com/userfiles/files/kesomok.pdf
    • https://hamasataccessories.com/userfiles/files/59075180025.pdf
    • https://thomsonindia.com/userfiles/files/losolakadofesinokezi.pdf
    • http://severstroysnab.ru/userfiles/file/sunukuxefe.pdf
    • http://zoop-tech.com/ckfinder/userfiles/files/gelima.pdf
    • http://madinagirls.com/easydo%20v2.00/files/uploads/pisigab.pdf
    • https://bi-kiesabbau.de/cmsimple/images/file/15893495172.pdf
    • http://agppi99.pretty-match.com/upload/files/pumopefudidiri.pdf
    • https://allora-tour.by/var/upload/file/63197787957.pdf
    • http://smalternatywa.pl/media/upload/files/a70134bb01116b258f30494a4865dd29.pdf
    • http://yuhongzg.com/d/files/88168948357.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce8416d37---vusixazozifej.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135e94bb5913---574033450.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/16702880455.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=when+does+the+next+my+hero+academia+season+come+out
    • 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_off0000e09d.bin
68a7e1985db2d8cd9be4608b2bf54bcfa645d0dc4121b19f336d1ede4c4664eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 10900 bytes
font_01_sfnt_off0000f9b4.bin
ba01e9cda40256800917648cc250404f9f61cc96f2d012c23b411d1a1f9ffea6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 18068 bytes
font_02_sfnt_off00012888.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12888 16792 bytes