Malicious PDF — malware analysis report

Static analysis result for SHA-256 a064407fb597fa8f…

MALICIOUS

PDF

106.8 KB Created: 2021-06-10 22:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9373d1b9df593e1ba5b94acb428cb69a SHA-1: 8eefd43e73983b88705c6cb9037d55a27e6a8a8e SHA-256: a064407fb597fa8f3c05205867bcb386d9df98c1fb9357aa867652fc032bf8c4
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=download+game+ppsspp+bola+2021 PDF link annotation
    • http://ttccid.com/userfiles/files/91362409951.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f5d6d06410a029c4149f13c1a0c71c89/sozuveki.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/41900909646.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/njorf1c2ntokci2mrabg2parvp/61900898614.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/96909390933.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/mbkk1eb558ava42f4olsilp8r4/20080891487.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/3d0b64cf9016dece678a64d5a89d6e03/nadikinegig.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/963ab822a275d0a924b4519ab82309f5/daxezamu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608964ad94054---jodinowutozugoterexaze.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/botowogajij.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/cd354c65983b06488abc3d72e4548c6d/65318764904.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37205a9a1b---75792394271.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/sevukilugumolevi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160908c7cc0830---41331191097.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tejolalaroka.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/42e7d9b060651bc732e43034296dba76/xisokotura.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/42505356715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000163aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x163AA 25044 bytes
SHA-256: fc8754a28feb68179fc1a4631045c1c92088f3cf608bf3b087e528694935dcfd
font_00_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 5400 bytes
SHA-256: e3c7a517b838bb1bbe697d4c94ea6fd0f74f759a6192237b8e9bc6e4dc6ae41d
font_01_sfnt_off00012fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB6 17552 bytes
SHA-256: aa64e27b26b84673145a5cec5d5822e80068936c7df25d9f9fe1642c9bfaae9e
font_03_sfnt_off00018ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FF1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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