Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a55903f7d5d2537…

MALICIOUS

PDF

84.1 KB Created: 2021-07-02 19:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d0e7c96601d2c85556284877e3d3a76b SHA-1: 77af5ed95f879f3c3a74a2f7b6af4a773e38f40d SHA-256: 8a55903f7d5d253742248e5cfdf1cbeed061e5eae4e9ad983b40998d5be21238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The embedded URLs, such as 'https://chcial.ru/uplcv?utm_term=basic+engineering+circuit+analysis+8th+edition+solutions+pdf+download', are designed to lure victims with deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://chcial.ru/uplcv?utm_term=basic+engineering+circuit+analysis+8th+edition+solutions+pdf+download PDF link annotation
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608621060a42b---32546679816.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/nrgicn8vba5ap33d7br8epcoe1/55343102070.pdfIn PDF document text
    • https://efnnma.org/files/file/15577677499.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a7f1a1cf86282a1a100e16b6207c7f89/92989137420.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/38426613258.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b497620bc23---kuvubi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2dadea3cf01606329d5d431212da6ca1/buliw.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e09d8a4d---fodiketud.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a0148e1b5---burulojuno.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/4879475298.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a2b96c5dd---68173273863.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/48902641730.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/losoguw.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5fpqs1cs25imb20k87gebpq41t/rureribiwuwo.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/48225500695.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/l82i056does9d9d57v93lcd8ih/76872407712.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e7963b3221916fed1c7571cabf52090b/datadavarogibogevetof.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202105281962_92093362.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/33725633755.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ed39a6f45bd834452810f6dba02b2c6c/janutanosadigon.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b0cf3f4aec6754fbacc07352d4b6330b/diruzupifipopojurudikenu.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_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 11460 bytes
SHA-256: 9a675b51153b0de4c9c6965e965b750467b536d34fc47ebbee4f9fb75426e42b
font_01_sfnt_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 19056 bytes
SHA-256: ed4c9271825bb89caf3f528cd89104e58385f9c846d160c64bfbc6a813904acb

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