Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc3b11093a498c8…

MALICIOUS

PDF

87.4 KB Created: 2021-07-13 00:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89b67d29d4f91d7f1270c767b79dee8e SHA-1: b819e58cd733d10d1e6d6112e16634bccaf680d8 SHA-256: 2fc3b11093a498c8044da51e65863d5b0b3e3e04e76c217acd5191db03a5f9fb
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits vulnerabilities or serves as a phishing lure. The numerous embedded URLs point to compromised CMS upload directories and link farms, suggesting a distribution mechanism for further malicious content. The file's structure and URL patterns are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://esthebel.de/userfiles/file/40001511626.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16085336caa46f---99121748501.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071caa82d937---notok.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/196a45e328927f2eb2480783a0111a75/54043999892.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2be1d23196dd06ef32866f1713108c99/99562441228.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/gefukuvewurififanum.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/kolunabezifazibulezike.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/lazafulaz.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/b65m6en5gqs1un6jdvoasu6jtg/julapemuzafedezib.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/koremejubopavufokalupu.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/66678015910.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/98011642521.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160989bbc14847---15349184943.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/65925752573.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210703115046.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607031f7d723a---2668591459.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d14499460fbca1472c1b718e75b536a9/7428006555.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ijabljre3snbd2ckf3nu1ghmkp/minenikedusadumi.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/kilekobusam.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/58540554187.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/26f8b97d0ba2430d8767fa4db6bc49c2/23458102547.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/vipek.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/93n7tov2nbm66b3c415206t9f2/jefewijixavapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cushings+and+hypothyroidismPDF 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_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16340 bytes
SHA-256: 81535e493a594dc28cfdcb4adcec34b34efadc426822418e712c66cfd4da65d7
font_01_sfnt_off00011f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13797 10904 bytes
SHA-256: cb95525e4d2b4da6328fde3b2bbac5738126d88a6a75ec57327615bfc0c41a4f

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