Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade28a22ab49bdd2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 05:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 034d0fbf55ea5faa324d27eca99ebdd7 SHA-1: 97c99fe7450c11a745091fc4dea3d01eeab8d68b SHA-256: ade28a22ab49bdd273c0968e3f28f6d1f47ac7dab56fcebf3dd5476f1ebd67c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=flightradar24+app+download PDF link annotation
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b49e646a4928d91f52a5db51854a3cb5/80342723744.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/44438139185.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/podawunorewigevetanixa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf36981ef0---lekud.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/t3jupfhcfif0vsqi8an90n7d24/tesowus.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/18246646163.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/18238964563.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/49017174561.pdfIn PDF document text
    • https://tuinvandecruys.be/file/36871105382.pdfIn PDF document text
    • https://casaalu.com/luutru/files/wapugewazunesoduzelevovu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5b74580105ffbac02fda4683eb08d25/zukufulifesulu.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/jutokizurusimozozusebe.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630520831/files/vubixum.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/77f2f45c5b084942c8691835dc777457/80825373933.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/99638700496.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/36444212134.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/30864526817.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/47468141794.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140916d6eb88---xewexiz.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/bonal.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/zikeluwomulowosabodar.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/josusawo.pdfIn PDF document text
    • https://kimcert.org/E/file/66171257096.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_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 10632 bytes
SHA-256: 9b94a4f2dd368e573fc665d29349a9bae8642a5a5d437dbafb97f8b4e85c76d0
font_02_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 18244 bytes
SHA-256: 6f6276035b9c8d86a0f1decfe7baac4e5e6fa9ef018632f7999e5ada087a911e

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