Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d792c392c2bddd…

MALICIOUS

PDF

89.5 KB Created: 2021-06-28 16:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7cd22d3b8a0ff0308c6a749e8ebc7cc2 SHA-1: 5a90106424970a66aba546c30e50014e881b0bda SHA-256: 53d792c392c2bddd2e0517b5373f99fa5bcd2e1d1a22d307d237e6245aae9f66
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://poolpoint.be/uploads/file/juduliwokaloluvesi.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ba76ddd18---84871887906.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/korilajozavalizudapu.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/tafukixeti.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a500c3bd118---wedafikusosadopowud.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aee2bd4e28f---88478045026.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/18127961501.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///83215419944.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160992e4e77336---farirasejifajipoxevalo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075280aa941a---8614341862.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/56642908534.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/22d2fbabe78d733dc3e49cdab4d79005/87893993264.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/96590392770.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/bni1vd9njobhsp4ighi4fb49h0/33414755646.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210601114315.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/wexuxinapiwigam.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/munebakodevojun.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cb39e27f6---jorinokupebo.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/sivarujesum.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/oavq6f79nvqs8lkaiknfkkh2qu/23247654144.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/gn55qqrcmaidldu7ffkrpmd43t/maferonadowizig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=depressed+and+suicidalPDF 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://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_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 17640 bytes
SHA-256: a0198616fd4d274610711907d3a9e0aa77c8a5ea8aecbe62ef058d34613f7a6a
font_02_sfnt_off00014172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14172 10392 bytes
SHA-256: ce6498f18f6766b3a7bb9f191a19e300a05d7e2aa2c8504ac7a295b5368f9268

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