Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9603045bbc76310…

MALICIOUS

PDF

79.6 KB Created: 2021-06-17 23:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb6e305cb1c81f82e50f5075684899ff SHA-1: 5cae3bed375f9c58f1d824ce4a5780a066bd5a6a SHA-256: d9603045bbc76310e6f19d06608961e8c173256beaaac6947fe8adf719087fb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://esoftland.com/userfiles/file/sozidutupolinanozen.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607135c2496bd---dadusoratavawegud.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/m77vfht21t5q03ujcq2h11g5en/varopenexivog.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf7834edc8---gugudejijilefezopadusoku.pdf
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/munumiputiwodosiropejud.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb6e17fb10---90927239528.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5e8087d3b301b2a9ebc80b59812f1433/12107505932.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c11fb1eaa---boditiwab.pdf
    • http://norilskgu.ru/userfiles/file/bafufawobazosu.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b12e9a3a400---kofawumixekibusulelawowam.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd61ddeada---zawus.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/58f6ba3c19bda107d9d92fdcfd408e1c/lawupewuvedegaxiwitepo.pdf
    • http://randoquad72.fr/userfiles/file/lilusomopiwijomufinutuza.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ac53929f---60237710603.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e0f0041a---danomi.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45c960438---9776052669.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c5d84da417c5b9b6d87e68d6974d4a23/92477925203.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=maharshi+telugu+full+movie
    • 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://scripts.sil.org/OFL
    • 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_off0000e43a.bin
006614864426210aadd018fd7ddeb03404fd2d015e874d385c38003eecf550ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 5244 bytes
font_01_sfnt_off0000f5fc.bin
846655f98614030aec1416e070df027d587e4e7d30239853f0fb6ff8677a70de
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 10684 bytes
font_02_sfnt_off00011ae2.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 16164 bytes