Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21c4dc96813fc83…

MALICIOUS

PDF

95.1 KB Created: 2021-06-29 04:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 100eb42dbd8300adea7790edf13ce892 SHA-1: 8af6575c64ef6a6f49e44a516c84a6206f2bb5aa SHA-256: e21c4dc96813fc832c6cf51728a08676a346200a8210555e372153409b10d2d3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://garglob.ru/uplcv?utm_term=what%27s+the+difference+between+german+shepherd+and+belgian+malinois PDF link annotation
    • http://scales-center.com/shop/fck_file/file/52875496071.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a1fa2e1143983fcc46f72226e5920781/sabulusugedenu.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d784cbd430c53c3e9ef09686320057e5/jowofo.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ascbh0pbvjk3koc6pmpeltel07/viteposirebusolut.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//49294084656.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/rokexizulusemovot.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82dddb848---87174007683.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0631399339---wizutewer.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb17937b9a---musenomo.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/5960661183.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63881e9979---naxuvozaladetudasi.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d6953fa99479a825ed876167e973e356/kunexizamukumesifidotavov.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/97c0066f7f6b6417943f6551e911a7dc/naxuxuxanutefi.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/93552163518.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/mowopafofojitasa.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05ab85b968---85299614207.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07be80c39---19484897184.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607623bfb78d8---88784534592.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/kixixiwibavo.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/10313532935.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/31e8fbc79ec5fa552c94820af1f1b3f9/vosewali.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/beliladuvinipuwege.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/907130d967592a874edb2c0f06b2cbff/66396404918.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3d413583671b55c3e44a24f05e4c6b8c/ruvodudinubamapavogevatek.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/75552830584.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/lomutuvot.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/84ada8940bd55b8c34abc0da5b458c0c/rinolebo.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_off00010f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 17196 bytes
SHA-256: 2042a022a3c8ce9838ce2666585ab8ffebe755d15a94c572f92fd3433ffe5d48
font_01_sfnt_off00013bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E9 11320 bytes
SHA-256: 9a7f6a37b2acc72cce2caa6e0daa7fa53f4bd24e83df05cfbacc179123eb8c08