Malicious PDF — malware analysis report

Static analysis result for SHA-256 63063887c688414e…

MALICIOUS

PDF

80.1 KB Created: 2021-06-24 05:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acba7ac2b4073f4aa91ca1f633ab52d4 SHA-1: a3b7397edec691bb6e06688c3488dc22510aba69 SHA-256: 63063887c688414eb5ca05493221465a75e76c8c502a268fd2115839c4412a7f
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many hosted on compromised CMS platforms, directing users to download further PDF files. The document body, though heavily obfuscated, suggests a lure related to '6 minute english pdf download', aiming to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://afghansolar.com/userfiles/file/44510404064.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/057cbf5aa57ab96252cd447baa1e2f4b/guzifitixupamapuba.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/zidototerenuzurupimali.pdf
    • https://shreenathtechnologies.com/userfiles/file/wadudenezisij.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9c12d1f36262b2d3fe8461bb00bb0c5a/78927118256.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160baf6d4b2860---xetupuxez.pdf
    • http://www.monts.sk/upload_images/file/kawawugapoguxoladewitama.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/zafowa.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2e976cf0ea968e7c4a76bdf1bba9bb8c/60864780944.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a17c6ba7e---56450014095.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfe8f00b31---nenilez.pdf
    • http://aranykoronakft.hu/userfiles/file/65742722564.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/84a31d061ac43ccee1b67044ee9ecb5b/mokugevixikose.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=6+minute+english+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f705.bin
06c6c6d9ad460d515cad81ca00d512c5213aac7e7bcd032e64ba683fd91ede85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 5512 bytes
font_01_sfnt_off000109ae.bin
efaa256022d99d56f0b5c68fb29cea5b8e2cad82681ead0d5bf90e2b31e5d93c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 12716 bytes

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