Malicious PDF — malware analysis report

Static analysis result for SHA-256 b760c5932fa95ba1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 20:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 568f65076ccfef0eb87e2beb7d3dfddb SHA-1: 8652ebcb8d829f06b3e31ef39c3e7bf019bb9039 SHA-256: b760c5932fa95ba17b4b092850cdd5d907c2877b800475194089fc8b896e8fc1
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=app+disabler+apk+no+root PDF link annotation
    • http://asacnfservices.com/ckfinder/userfiles/files/79831920154.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/kivudewatu.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/44867366782.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/072f2c61a5f50c5a9a195cfeca9fe734/pagelorebigimapijulilo.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/tamigupo.pdfIn PDF document text
    • http://beijingteye.com/upload/files/35600320974.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/70840199881.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc8503b77---47170084589.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/25820195860.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b46e80d25---5967546375.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/29083548009.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/desenezawa.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/ziloralupa.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/25199513242.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/famigexejexapotak.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/renajotamila.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090723484480554.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/55791307689.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/85362226672.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/33349324356.pdfIn PDF document text
    • http://nensi.si/upload/file/pagelerojefub.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_off0000bec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 10600 bytes
SHA-256: 88a4d5017695063878080ffa5837f0eb99e2ed2174cddda4f21f029e799ced3f
font_02_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 16720 bytes
SHA-256: c181fd633873e6bafdbf1a644ad613e21fe8015a0d407fab913a8f0b8ff6dae0

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