Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c33110f3c4245c2…

MALICIOUS

PDF

69.5 KB Created: 2021-10-03 00:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b37c4b428517f66b562d79c75bfb67da SHA-1: 02b616721380a71b9d4db330d2d0c96c047e283e SHA-256: 6c33110f3c4245c266bcb3a3e4f6c864a84cf47f67266b4e28d4fedc819ffcc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The document body was unreadable, but the presence of many external links strongly indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=having+two+identical+alleles+for+a+trait PDF link annotation
    • http://tienphat.vn/imagesflashupload/file/9894266628.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3178051b---sopezer.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/313fdcebdea5623d20320210741ec9b2/90449139550.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/2443133892.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/36105335938.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/88223945279.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/65489699009.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161396f704d8ef---fizodurukapasijusuk.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/74299649209.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/fasupegaxerolezelir.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/verodazasajadomasod.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/guxaxufepexa.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/zofavipawojimo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc7b632149---1850511132.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/75034932330.pdfIn PDF document text
    • https://migger.dk/userimages/file/matikenagonumusulon.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/jojowunizomawavenofefiw.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/garuzatatenakixov.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/70780182086.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/25479932319.pdfIn PDF document text
    • http://poultech.net/d/files/63677797765.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1fc049404---31805796591.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/88387394813.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/vomoki.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_off0000b2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B6 14528 bytes
SHA-256: 4f368d2d9c3b8c64123ecc0d08a85f792b6d035352c453eeffabc5fc538d0e81
font_01_sfnt_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 10796 bytes
SHA-256: 3e59e0355001cb70dddbcb7fe17924451a94816088f8366caebbbe009f199021
font_02_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1