Malicious PDF — malware analysis report

Static analysis result for SHA-256 592e4a1b0a419550…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 10:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5fc415fd1b9e53f24d8d1c7c46949c2 SHA-1: 65d5a2c824537a752b3fff1c55751ccf88e2a600 SHA-256: 592e4a1b0a4195502aa8306772b6f322b2fa7e7f48421fc14830f1add924625a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable domains, suggesting an attempt to host malicious content or phishing lures. The presence of a visual download button and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to trick users into downloading malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=gta+v+game+download+for+android+apk+obb PDF link annotation
    • http://autofactory-jin.com/js/upload/files/18500246233.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/webaxojotomotasenu.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/rajuwipalijet.pdfIn PDF document text
    • https://mehregancenter.ir/images/upload/files/73962784020.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613668d9e0139---bepelubenuva.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/kuwokekasejulamurosevu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/tododoboxeravetovari.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/68260522553.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/zewusovosamaz.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/35624236244.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/28008699516.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f57d194716---58665815272.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371b0413040---jefetekuruwi.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/73144847661.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/86695049043.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613031766afd5---91752278700.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/78890199723.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/13222911739.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368fe162856---43975969309.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/17665442683.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/40131746032.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BF 18392 bytes
SHA-256: ba5eea0315927173b4cb07f34af6aba4835d854f189d4572bb082203523ded7a
font_01_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7B 11096 bytes
SHA-256: b2dc2d7ddf0462090a8f8fc08e6476cce9efad8f58244e9e48ca5e262de36478

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