Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95366b4b36c5950…

MALICIOUS

PDF

135.3 KB Created: 2021-06-29 02:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f0fe5ba050bbec0da922b5990b996ec0 SHA-1: b5a5a511db83aa7d607bda923ca026b4dc73a94f SHA-256: a95366b4b36c595064d8765b36088cd7615cde0cb13080a97409bd9b283ad224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://infrive.ru/uplcv?utm_term=behringer+x32+operating+manual PDF link annotation
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01ffb5e32a3505b4e642e9d03cb8c1fc/titotupapunilemubimup.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/mgp3iq2jhcdprcjlrrpi67n8n1/44707910747.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/33438875223.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/guvanuwad.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/38980674704.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160be3787f07e5---dadesobavikevalilafe.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/83895252190.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/tobakakuvoruk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b541687b2dc---gisinusanelugunetoz.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/24693080355.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/92697211894.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/7c473dd3b0cdb646d5f317dc3ac9f302/vofiwivefesumez.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed779e5deb---28046095583.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/69336507725.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/vozuja.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/jokamufevaxapatezar.pdfIn PDF document text
    • http://chieucoingason.vn/files/28535746011.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2c71949015e7717b967fe8abd0cd1fee/40462295544.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1624367199.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ade9a67de09afb0d901377f2324a8260/20760517395.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4134d186dace55cba0199583fda474fd/pibor.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9nl1frcfg34fl9ttma4c7hdi13/54811195510.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdd6eb03d---41236513983.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_off0001aa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA62 18872 bytes
SHA-256: 8f911037ef96b05479f4c576bca90ddf16f9f263d625a17dd1e6fed582ec444d
font_01_sfnt_off0001dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC78 11076 bytes
SHA-256: 88b41d5836920f24833beffffb43b7be73c12a78b9898568cbff5b76fba26b19
font_02_sfnt_off0001f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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