Malicious PDF — malware analysis report

Static analysis result for SHA-256 218b67d8d43a80b2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 05:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6a3938f89a48a28c4863649ea4f2c28 SHA-1: 92b97bfe0c2fd9135e63871d9d3cb38e2b35cc40 SHA-256: 218b67d8d43a80b25337397aca13cfab5b7ac5cba2cd36e9716a71dc714c4858
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This 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 compromised WordPress upload directories and disposable hosting sites, indicating an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://druckmaschinenservice.com/uploads/fce/files/5635156293.pdf In PDF document text
    • https://z87992961.com/upload/files/20210908064556.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/vegarowuxo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361e122a9c1---rumoxorupejixa.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/bolofenesinekupeb.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/37438279900.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/xesopawoxonikijaroxe.pdfIn PDF document text
    • http://centronegozi.com/public/werazowebil.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/tiduzawijipesubepidix.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b55f6849b---31917204383.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/80027746652.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/wupul.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/39607307847.pdfIn PDF document text
    • http://rsentco.com/upload/file/74839237922.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/7574096257.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/23847350030.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/86918428337.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/wulab.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/zudunozu.pdfIn PDF document text
    • http://short-story.ru/upload/file/34505458344.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/11411899705.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/72026333545.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/natadu.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/25040064457.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130909697617---juwaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=garuda+g3+qr+codePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB619 19292 bytes
SHA-256: ce4276200a2e08ddf75f3689ff89f38ce86a4033bb60b5d985cf4d25e6f6885e
font_01_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 10492 bytes
SHA-256: dae81a47b8ab598bf9b3656fb64889ac02017cc3e517a6e6d30658c7dd1e49c1
font_02_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 17520 bytes
SHA-256: e949da6121b7235ecc7a5bbc1bc754b6171d9f4be56d7bba4b4def753c1ba8ba
font_03_sfnt_off00011a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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