Malicious PDF — malware analysis report

Static analysis result for SHA-256 3303adeada217cc1…

MALICIOUS

PDF

154.8 KB Created: 2021-06-08 19:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a81a611a392e31daa2460ea403bd422 SHA-1: b14dfbc0cf5c8f56301189a6ffadb32b525b5905 SHA-256: 3303adeada217cc1ab832e17e4383a4dce6c80d2eb520fd39d086f97a51700d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript 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. It functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/uplcv?utm_term=death+note+relight+free
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160895b33da7bb---44892484273.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160970039e3e9d---71318643103.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/re6epalb289hpvjbqqa1253jh8/dozuvugipepokenefedut.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2b252cca2---vudole.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/g17a1grgmudk1vq3qsou38s042/gijewikiwiveguko.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729c42c55e7---71318047741.pdf
    • http://szakkepzosiklos.hu/upload/file/77925724018.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f4f6adf29a7a49ffa31d68fd3dc9386f/53371548582.pdf
    • http://fujiya-la.com/uploads/files/63924884227.pdf
    • http://charivne.info/images/file/wezuvawolil.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16071fe5d35377---26676060936.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0c3897a4c---vexavof.pdf
    • http://fogathajtohirek.hu/fckfiles/file/risep.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6404ba4b87---65028310177.pdf
    • http://cephedanismani.com/images/pages/file/46924795077.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file/%5C/20210508174745_830715060.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b53e.bin
c4e09043a25d1d1ea1c9c7fdc7183d20c1a7da604652d0becd780f3c10084449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B53E 33320 bytes
font_01_sfnt_off00021d0c.bin
9eaa3bd366029726bbb50641a3e8df6f2295eb8245d98f0ca1d97b06171c945d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21D0C 4852 bytes
font_02_sfnt_off00022d90.bin
598e201ab0bc991575b7475d40e3db87857e75958fdc1f1cf8da9da63c389244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22D90 15720 bytes

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