Malicious PDF — malware analysis report

Static analysis result for SHA-256 344f7875dbe8d99c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 11:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88daa0baa330d1848fa502cbcda4870e SHA-1: 7107a169549c390728c8dd565b7a26ad8560dede SHA-256: 344f7875dbe8d99c206de61bad97d8b1df793c59462b6a972f796c789a137457
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. These characteristics, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://argekaucuk.com/nbg/upload/files/19911962013.pdf In PDF document text
    • https://aplusadvance.com/naver_editor/data/file/11401654879.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1l9fe3bc4prdna0j5idvg8d32u/ronipiwipuxudif.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/95320343870.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/berak.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/59045626728.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/wepoxobasemulizo.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/pufof.pdfIn PDF document text
    • http://derma-dts.de/files/file/18748110896.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3731b05cadce60f5d1c89f30855c8d15/tibiniwutiwafebo.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/livafugiwebup.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/bibonarakisudida.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3dd52bfb9---tilesudediwidowu.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/pibilefafibib.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/89866381176.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c016fdaacc1---68770474856.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/gopasuzivalewusesitodil.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4bed143f18---28276266626.pdfIn PDF document text
    • https://cmoretv.com/userfiles/xerexijixar.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/68864773098.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/wewivefitulifuzo.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/28239409049.pdfIn PDF document text
    • http://abwessex.com/uploads/files/gunusasowanib.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/luvokoraxirejisemoxupuged.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/28934141831.pdfIn PDF document text
    • http://foodchemsino.com/d/files/wefipamofojigilowirip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gourmia+5+qt+digital+air+fryer+manualPDF 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_off0000cc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 11060 bytes
SHA-256: 18b764ce5471288a76411175b66384ebb42b21a90b3de8411853f81dc298ef4a
font_02_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 18184 bytes
SHA-256: 8474c4745103490b657e0bde1f6b9ae067e8447a97874fad89aa38baece9df37

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