Malicious PDF — malware analysis report

Static analysis result for SHA-256 656591a8f6bf1533…

MALICIOUS

PDF

83.6 KB Created: 2021-05-10 22:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1e5311cb78c7e761edc6358a67ef3a21 SHA-1: dda742bd88d675b37fe0588a66977dac99975270 SHA-256: 656591a8f6bf153353c961b23c28b934b85768771524d24da0752cb6df2f2790
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807e41b28a2---45478585901.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceeb166079---dimij.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xoledabaxenowagaxirezufik.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/93385422125.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/54474846489.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd4d3854b---dofoxovikazemiruton.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc802d0ee4---55547962099.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/fefipixopewafuw.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/b9ri6nj095cpsn1arnstekp1c5/pijam.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1c6ae2b3---18673168298.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/nf53a8bnb8ouvfa5k4mlg22vk8/12503513278.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841f5ab4f91---98814734924.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160799da4a3c62---dikupenezafulelu.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/be460d1a74d37893096e1404ec99c0c0/35635934037.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=whatsapp++windows+7+64+bitPDF link annotation
    • 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://scripts.sil.org/OFLIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 4124 bytes
SHA-256: 54ec535ef197753a6e2d7b78261fa401de4846f7188b88e5619fd931346e0316
font_01_sfnt_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 5156 bytes
SHA-256: 684de68bd9a3fd438669e6a7be29e437823e917bb31ac56f6ddf659f1dc104bd
font_02_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 14188 bytes
SHA-256: 5f6a7361d625b8f008f708092ead29ce46d1432434299fbc1717dd221e41c012
font_03_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 16176 bytes
SHA-256: 2e585788e86e0bf007cc0c0b1366d45424316cc02a823294f974816f9fac65df
font_04_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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