Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3e043ae08263bf…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 21:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c3aab3d1ca3e0bc6db0f90142dc314a SHA-1: 503cda315fb5d8b088979e5c9a984eabb3965d55 SHA-256: 5a3e043ae08263bf956cfd5126fdf8c55a010f0b5562518a6a36e71d4c1cc3a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://oniceh.ru/uplcv?utm_term=cultivating+intimacy+with+god
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3mjiabiq4vhaunkevk0o3373h4/kufakavupegepowokizudami.pdf
    • http://sevimticaret.net/userfiles/file/4572136284.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b50982d6---13603900819.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082065802b61---vububoseraxofewoku.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4248952238---kijulanolejikidenu.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609137ecde1b9---teresatobevisenepej.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160af6de13ddc1---pivisagutevu.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8113ec92d3---46902313898.pdf
    • http://greenplanetnepal.com/userfiles/file/30047736425.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071700fc2814---buxegesi.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4c75f437342fe5674cf1366d3ea2c0ff/gumitilogivezaxap.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60a9898a1---78440660612.pdf
    • http://nakatka.com/files/file/96869710853.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ede0616049---94231996375.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/a57f9994c04b80b08ecb082b7c595250/14416186274.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/lirijixatirup.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/zasafozemomikog.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/0d03qratcbtliav5tn2pfk9br2/besosef.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a72aeb0864---mewojofazute.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b694c1f2a3---43726129115.pdf
    • http://frangarcia.eu/upload/file/lezokunumepeti.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/am07lmf9vff3i3d8l4i2qfdip9/81397620343.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/32082583912.pdf
    • http://jentretiens.ch/uploadimage/3577200600.pdf
    • 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://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_off0000f261.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 16792 bytes
font_01_sfnt_off00010a73.bin
aa46493d3c59e96582604ef069ae82579a75461c327274a96bc7fad4d4da8a71
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 16768 bytes
font_02_sfnt_off000135b3.bin
09206001f3bc611a9976f8ee5985dd103830bc8c2f6279ce6fc5877aba0b8a69
pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 10816 bytes