Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4905d188ea73cb…

MALICIOUS

PDF

95.2 KB Created: 2021-06-12 17:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 01a0934eb92317a727611b5ab379a90a SHA-1: 7ed3b88d2aa5b4b73a2456757e6de7fe38495488 SHA-256: ab4905d188ea73cbb4c3d389efd13284a96e33211160422a9d4ec1650f25490b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and ClamAV, indicating it is a phishing or trojan delivery mechanism. The document employs SEO poisoning tactics by linking to numerous compromised WordPress sites and disposable hosting, aiming to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/uplcv?utm_term=english+speaking+pdf+free+download PDF link annotation
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/7lgc46to60bfj3p7ovcqfma22n/pisebuxo.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/9ba9052728d23dd6505afdeb92e3b06b/xojipekidenopekit.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1365a2a7---petegubezojekovulazujunez.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/48905796235.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/38087657088.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/e281b4fc4eff03e607aeae0db5149ff0/14817059994.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/577c0a31c468c3ae34d4df111850c51d/kugulupakavoxadupa.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/pezolepenegadodifazuruk.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/55375361326.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105161525107674.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdacb41202---65444730547.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/4bi8td8fum0iv4obgh5msdk3u1/goviri.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/37c1b7f6cab7dd7649457129a4cf11f6/xuwanusokedikutimivoweju.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/kazaj.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa7e3c9d2---gopemera.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70bd79474---38217847834.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 5416 bytes
SHA-256: c465f18eff98791b454a6f8b748c3876ebc785ee2f22250c68d31f5d54c9f624
font_01_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 10840 bytes
SHA-256: 504328ce9df36bb02af81f1a7dcf1e24c70f0626324f1572994f926b95e3852a
font_03_sfnt_off000140e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E3 15556 bytes
SHA-256: f1f88f951b778a6705b92bb876c460341fd90f6194d3f9161fe810b2d7e6200e

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