Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa667b862368c80…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 01:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f9952c576ae0ea6e6ebb17a451bfedf0 SHA-1: 09f4d647a775953267feb6e8cf174bc491d90ab0 SHA-256: eaa667b862368c80884f82dd7942f83e487e581e15304c20ff8ea1b76d2a7c56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and other domains, suggesting it's designed to redirect users to malicious or phishing content. The presence of JavaScript points to the use of T1059.007 for execution, and the nature of the document implies it was likely delivered as a T1566.001 attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://oniceh.ru/uplcv?utm_term=poco+m2+miui+version PDF link annotation
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/4es69nf93eao7do2ghhdk8ji7l/gagidubepevavopadik.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/35082711327.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/57226861388.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/94756200656.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109041326561372.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16150b53ab780b---xanibuzadokib.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/67837027953.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/jigulalo.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/72498252824.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/82476786219.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/48158010829.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/lowivinelowimidivom.pdfIn PDF document text
    • https://vitanov.rs/files/48985952833.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/lexapizot.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109250545472463.pdfIn PDF document text
    • https://greenways.at/userfiles/file/3998872576.pdfIn PDF document text
    • http://czminghe.com/upload/files/57580058813.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/jebur.pdfIn PDF document text
    • http://jonellchem.com/upload/files/29145307509.pdfIn PDF document text
    • https://slide-bearing.com/d/files/71570761162.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/tu88fgic4jgal5irc1ttdglp86/kowaxaxoxizabafo.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/59597056686.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/pewimepigubukekatamawer.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210914_083256.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/54644878123.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/99346253159.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_off0000b044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB044 14656 bytes
SHA-256: bfdcbee5049d52c9ade007ac550d8295bc096f8f2a0c440354fa2418c3391757
font_01_sfnt_off0000d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 10372 bytes
SHA-256: 512b4faf95df7f6141ce31289f293f59f4e5327e5dff90ee6e959e97e846fb8b
font_02_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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