Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbea1703ae1c144…

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 01:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a4d57ec75ec2187a00e7aba563aac649 SHA-1: 6306658341762795effbafc7e2a49b963040b76e SHA-256: 4dbea1703ae1c144713597d22bfe9bd4a62195fb96e5269daf14aa1a4c6119a6
156 Risk Score

Malware Insights

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

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, pointing to numerous compromised WordPress sites and other domains, likely to host phishing content or further malware. The presence of external URIs and compromised CMS upload links strongly suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://pistant.ru/uplcv?utm_term=spanish+for+code PDF link annotation
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8f764d9474699da28bdf99132ce97ded/91386109050.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1103d48c---konamazonomijulosegi.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/62388284390.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/cd9b46e7be2c21c49b1f6dcf989e25d2/fipatezasenapoxolamugu.pdfIn PDF document text
    • https://waroproject.com/file/libujomugo.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/wiwekudomo.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/83290254788.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/fuziboxus.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1279dfabb---xexanomuwobixolutigov.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845660a173d---9551819680.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/68758009004.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/80686052736.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/b483jufboumrmr3evbo1j323h1/ludefenoxigesawuginigo.pdfIn PDF document text
    • http://esistore.be/userfiles/file/6260521393.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd26873d8d---lefasuguregeferiwejaro.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/283936740.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34d813fe8---59964423697.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160da78c1cd2b1---dupipabikaturixopubumebo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf14304e23---fawurijugevud.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/gukosonaga.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cmpi0u10jabg229rrtrjckgcne/kugugufixajesejumisenaj.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lalexakafodewav.pdfIn PDF document text
    • https://studiorampinelli.com/file/9724325254.pdfIn PDF document text
    • http://bscartridge.com/pic/59617487073.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/94335286362.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 18028 bytes
SHA-256: 592f11424d1afd1a8d7751f26d05271e84d25915a1ec1abe8edfadb9218e16f3
font_01_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 10648 bytes
SHA-256: 2818fb129c60f882d7b541276f1f47e3c46848481004c21d75d411a0e1487e9e
font_02_sfnt_off000133c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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