Malicious PDF — malware analysis report

Static analysis result for SHA-256 988a8ca97feffb53…

MALICIOUS

PDF

93.9 KB Created: 2021-06-11 05:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2019c2f6fda5eb6a69def925ce511776 SHA-1: 1c4e2ef8ffb313cef4419dd341d47bad2d6f4776 SHA-256: 988a8ca97feffb53307a195d3ca25d2e250a72094288dea8892ae74da9ae6e73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of a URL with 'best free music apk' indicates a lure to entice users. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=best+free+music+apk PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e10869e38---fapilirudutujovagurutiwow.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/90110609732.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bmckohjoa2he0orjfvnm7k9pc2/43781195902.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/49945cd6930b2aee8af8d873fd0ece8a/zuzopa.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/c39a433fb16c745eb2c77780c1eab580/gaburunix.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e5f680fc29d1f5a9cebdc68a066f3521/82200932888.pdfIn PDF document text
    • https://lasanisports.com/files/dupezefal.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a290e7578bb---37684365519.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7433883a2a---tukodibajiwi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2d53489740bbb2900517911a4d0a1c7b/lenunakokisowekarek.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/vovatefurud.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/de79e9696404aaeab478d5da21201768/83413047916.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb2e71aa67---83603393508.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/661bcc951882254f5c71de9c8eec040c/lafuru.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/78vh8168mfvefpl4iildl4cqd2/29951142146.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/82452894591.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 5244 bytes
SHA-256: 47dc5f749199fe7d5feb79a91ee2ddcc01d4f202ec873ef8e153d8c56ded7026
font_02_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 5880 bytes
SHA-256: 47822431c50a9e0639c36d49ca47229ef914eb7a4619dc8368f37cd37319cdc0
font_03_sfnt_off00012db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 11332 bytes
SHA-256: 7c13e771b94bbeea5fec0265ae7b53cb38ffe084741e4587bf2e7d64690aa15b
font_04_sfnt_off00015481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15481 16120 bytes
SHA-256: 5333367eaea649b58cca6bbd35dcd4544797ff339368225ab200aadcb6a28895

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