Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f757b8ebdc3e1a5…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 18:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21d67de03ea28de6c25429bc29a834d7 SHA-1: 028d286ca028b6432b5960e22812a94659c0b604 SHA-256: 1f757b8ebdc3e1a5ce0bea447e22b43ed707cf37442df0b68c78b1fd5065f2d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs and links pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lead users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=neoliberalismo+en+peru+pdf PDF link annotation
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160993d16f008d---gozofipojeb.pdfIn PDF document text
    • https://thepainter.asia/upload/files/topivuvagejelu.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/kudapezigiwufaralowinixi.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/gokedenifikana.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/arnpqj9gqu7pnarh08pu1jsoil/bunazedatab.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/sedawijeb.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/zabeduva.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73a8cb40e---parubotemutogewowawi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/92966416013.pdfIn PDF document text
    • http://salkim.com/userfiles/file/sudog.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/likokepuvarimozinazededeg.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/93538871803.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607364abf404d---73919559958.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/41559852822.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/qssnimpead6hqltt0e0us9upni/fopojimaxikuwa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9d47b1eae19af96a855fe85559b7effe/kanijarozomoxar.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/zadede.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430202930929786.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2192198d9---70724607225.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/52622230705.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/28f296f4dfcd01c90b8a5d577ee6fa7a/22259562731.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5a0lddk3d8e1c0c8lct4799e65/jilif.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4081c158c0eb76d589114daa842aa3a4/zirew.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b760f2b0e0d6f44a0730788954615d57/zevetesomutewinoso.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/teliwipiguwe.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_off0000cad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD8 18244 bytes
SHA-256: ee782c496cad4a869bdea8b794e036de9de9f013792adf6887f7da7fdf5481d6
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 10776 bytes
SHA-256: bdc679c4d2c212efcf040a9585cd13481382dea1261fc11eddd6d91caaca45db
font_02_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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