Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c532ec2cb9fa7a…

MALICIOUS

PDF

86.3 KB Created: 2021-08-25 03:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 393e775641785d6e6c7f29df689f1eb7 SHA-1: 6c619b078790c73165da1a4e91e479f77c8cd5ef SHA-256: 14c532ec2cb9fa7aa6ea36b535864de3600a860f401420922069dc2cf3332c50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attempt to exploit users via malicious links, potentially leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=kinetic+molecular+theory+volume PDF link annotation
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/9ric7ppmmmpq7kvega6h4vcu7q/zovedodikotufebagalevete.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/fifeberadomalisazovin.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/95462781828.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/31079632452.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/dpd39mp8n1ddmoe3tksjm4ordq/51102697415.pdfIn PDF document text
    • https://wsbtitan.com/images/file/fagokemufova.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f410c3b8a0---95494600376.pdfIn PDF document text
    • http://compsult.net/userfiles/file/fuxovagoxonigomadixu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/3tarubc7t39qci5ef5ooi4n9d8/nidewedo.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/95593584945.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/bigonivefolanusowukuvo.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/30280479567.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/wutogifowuj.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tehq4eidbfn3tqedq20cutlqg7/fewifusuf.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lcrf34f0hnhdcuiuoobt76ovnu/zoxozapizubokobuligenis.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/mekatepasowovixogudu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fe8cb0591f367be8ae7aabd74d416464/38725813017.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/42t4v2mf6c6joqbntmmbvqmpji/4489795531.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/28758771943.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/665f15c2c112ae6aad7daecaba56e3b0/risomimajoxobofo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/aq7d8aatb5lcaslhs30qjl2bjn/kirumipamitujetu.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/84008527809.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/0f9191a28b52cb9d6ef273d027d41098/pejomezi.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_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 10596 bytes
SHA-256: fd0147329b9de27f3a3ae3c9162e1c44c21386068885f9711acfe70dec7e43d6
font_02_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 17360 bytes
SHA-256: 14e3fe5811663d4668e7c0d97faa6ed2824bab6fe8f550bea94799eff4c6d3cb

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