Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd100b1614af3c31…

MALICIOUS

PDF

100.3 KB Created: 2021-06-26 21:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5c9cc88f392574db41168a3785f9c2d9 SHA-1: 7222361afed6f285b8cc023b82f4a97e29c94520 SHA-256: fd100b1614af3c313617c0edc54d10348316ca6346683ed3942fc166325aa536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://coretry.ru/uplcv?utm_term=the+blind+king+odyssey PDF link annotation
    • http://elm3rad.com/file/vifanakabatexaxadapewu.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kagixoj.pdfIn PDF document text
    • http://dogable.de/userfiles/file/bibilerozuveg.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce0a90e47b---berixejoxagig.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0ba7d5a37e6800fef5b20338d3672b2e/tetegemisu.pdfIn PDF document text
    • https://btegypt.com/file/51420583836.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/66069915512.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/07adbc48a0b80fb6333d20808a2d6b1e/suvojisamisedadokedegupo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eb6030864---rupapexus.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d857503b---toligadufelajotivuwu.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/61377609620.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d97325f7b0dc6312ff9ddcd40ceeff4d/ximutuwo.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a21293cebd3af35ee9459a9d6f6da226/gevivezani.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/s92aok6cahnd5gplcbg53jat74/54651043190.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/r182fijft1qsfd38s72eh3eaub/waxoxanutovorojupidemup.pdfIn PDF document text
    • https://coil.hk/upload/files/kexaxinuzodobolumazis.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/tatazopevodoki.pdfIn PDF document text
    • http://yuha.be/_files/file/vaxupawelet.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffbc2d413c---jipetivurelixatulasuluma.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/dejujurukugebededowo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160806d6f1b273---38890655615.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160845532bd7a8---sozewivududowubaxopitoxos.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/hfi5lledrfr9ivtemdse80omjc/panonuzimi.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/40004377717.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/52eeefbc3047827f45d8284fdc42c1c9/xisutugezulawesafefoku.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_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 17384 bytes
SHA-256: 88f42cdd1b96473fb0de98e65490772f8afb1e6bd73197b225fd9fbe39c794a3
font_01_sfnt_off000152ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FF 10476 bytes
SHA-256: 462bfb399ea5d04c19c4b2c26b831208d256e5e770dcdd70eeb0d2492f789bbd
font_02_sfnt_off00016a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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