Malicious PDF — malware analysis report

Static analysis result for SHA-256 d675aad804cae598…

MALICIOUS

PDF

89.1 KB Created: 2021-08-08 20:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01d334ad672c74790022a5ae70f4acb7 SHA-1: 88be1defd99560c86a3d385e3dfbc2887d41a9c4 SHA-256: d675aad804cae5984134b90d4d92329fd5aa171b9f8e7fa7473eb1d8e7a3fd3a
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, suggesting it's used as a link farm. ClamAV detected it as a phishing trojan, and ML classifiers also flagged it as malicious. The primary function appears to be directing users to potentially malicious or SEO-manipulated content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c87b53600---37367859627.pdf In PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b52e3f462---zujereribolirafuririses.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/zotoxubatezori.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a26394572bf---60669044429.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/kubanuburetesogabediref.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/waxepeveruj.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/kifiguvuvetuseboweribexat.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a784305136c66da798f8b04d53698ea6/14582150381.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ace0c0a9353---81132173886.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gajovanepa.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/tomude.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a029587f8bb---wukikuvedadapitasexebufur.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210628_A88D0CB13C104B75.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/63329737517.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c3094a6ed---5499138260.pdfIn PDF document text
    • http://gewald.ru/content/Files/73208389344.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082498dd2be8---33701398117.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/nopinatevokapusar.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/22599779549.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r942s6i8ik6opb4kidtsskgm2e/45015205559.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jusoto.pdfIn PDF document text
    • http://talleresjpg.es/img/file/65017809846.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/25509286888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=does+apple+cider+vinegar+help+you+get+in+ketosisPDF link annotation
    • 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_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F56 11164 bytes
SHA-256: 81961f900e48dc3132116d4e4c23bda6f4538f461025998c4225391fac6b97a2
font_02_sfnt_off00012936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 16960 bytes
SHA-256: 94c7706a4c0e7df0834e6fcb4fb9713213eaeaffe5a195920fd6fb9c9fc0d071

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