Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3544a565413493e…

MALICIOUS

PDF

85.6 KB Created: 2021-07-02 20:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 48c54e387632ac99fe7b87cab863370d SHA-1: 87b06a8760f8d337f46857d0ed6b782dba6da7aa SHA-256: b3544a565413493ee1493f5a2cc07dcaece0bfe632e522092cce4da57ed1d682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

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://philabc.ru/uplcv?utm_term=cell+cycle+and+cell+division+notes+class+11+pdf PDF link annotation
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9c612026734d5102d7bc43f604a0f637/44943168661.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/12881594368.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210628215221.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/bixanikaxevenox.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ee73424712d6dcaa74dc0e529df6fc00/kapibupumufe.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qnbeu7gq4mfnpuqs1nt7n7io00/purizegoruzel.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/fojasajenojumufero.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7558c5cdf---xinuzo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b743f65a12---20639251908.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/45401534036.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608447f55a2cb---44671204687.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/98233042548.pdfIn PDF document text
    • https://andhimazhai.com/images/files/17419287641.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/31fcf9ce542ce4c7e2e1dcc406f921b5/lagubuwitirujorikuwog.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ba583aca5b0f0f05539fbbe11d02e121/66932917461.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/gobuxubibor.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/282110492928.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/51c2d46c92ac00129ce8a575aa5d2a24/baladufamiz.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609630c5611e7---48393653181.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdadcf23c1---mosakezuripuzofetezoji.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1hgt0u8eiqu480qsvssj0r2sg2/bufasafaralisugu.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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 10776 bytes
SHA-256: a0fccd9a1911dc46087106dd3e71c86b9d1d13b93ac6647eb23ad577b65e792e
font_01_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 16880 bytes
SHA-256: 8f38a2b2ec90f2cff9be4570805bb3d7530d9fe2354c8fd95a0f5d4aa081f631
font_02_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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