Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb70b6a606c6b9f5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 00:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08ddb1c18fbdea3eec89e235db589fcf SHA-1: 86595c56028020635a5f15779fba6e54bf51858c SHA-256: fb70b6a606c6b9f55a291851b68e14e58fefec1d6ad0323c9f9a779aefe28eee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojanized PDF. The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to lead users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest an attempt to lure users to external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/hrcagbvp2ra6ouo0i2d6rtrchm/52056832192.pdf In PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fe09966d791cfb1e14bee186e9d7dee2/bebare.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/13882336229.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/0ef0ffa62207eb1ed33dda1db1ba1999/51374083730.pdfIn PDF document text
    • https://roc.mn/uploads/files/xijujotefofefejuvizuw.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607273d93f96f---nedolukatozen.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607763fc08ebd---dekodibu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e645b2f1b.pdfIn PDF document text
    • http://altus.pl/userfiles/file/nawopovanujexut.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/fulegage.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/tetamilijusumigatirituj.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ee369d5a---batisolame.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8cb6b205c266c2575ad545f7b74bac54/jizududapizomuwuzewe.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/iogd3hfga14u8ut8697o7fcuac/66401491011.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///zukukanakuwujowegesov.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/34919025764.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/wimajijigeguridipisevak.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/nulobukopanijukivi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ae09f74809b---28893848612.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/96654471229.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0e6cb06dc---77962061107.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d501b924d---98713925895.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080c35b69087---mutevelizitefodo.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/53398580514.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/rozewetozokito.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3728086f---zixinodilemumebus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=danielle+steel+one+day+at+a+time+book+pdfPDF link annotation
    • 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_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 10908 bytes
SHA-256: 222234fbba5091eb214b6daa696e8389b57891f88314397f8a707c527549d97a
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 17460 bytes
SHA-256: 9a789a304da39311894a47d5b62f81235254ee7df172edef4c25e4734df561d5
font_02_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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