Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa9587e89aff66a…

MALICIOUS

PDF

85.2 KB Created: 2021-06-22 15:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 53f1c1dedb5438c6b174892642039011 SHA-1: b64047330a83837dfa7df5809a68d140d7454236 SHA-256: daa9587e89aff66a43e2c467ee948064ba3a8fe982346c391cc2c74d200d6155
156 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. 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 0.9996

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://krisoc.ru/uplcv?utm_term=zustandspassiv+mit+modalverben PDF link annotation
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/5bcb23d49226b8465579bcfb6fd20202/nosibelejefinujutiwu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e4319113be82c8b06ea61ae8a6fcd72d/26013256799.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948aba4588f---50930070889.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4c555cf3bcb70107501d3ca43e56d7de/55150854402.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872bd8c48e8---xazavutafonasu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2e74a2703---36373390409.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ak8ossgtqaiq8e521l4rttcbf8/jubifazefotenawe.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/zafudejuvogumobugiligiwe.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/vafotixujetufuxeb.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4eeadf3c087f8350821ef4c032cc2cf4/tunuzajiliri.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/5qlbpqdtk7cd33hjk46vba27q5/begevogisu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210525091433471349343.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c730bdafa99a9bbb7ff7d48e01cb1216/83151835666.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/73388343450.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e8c12838f---55410645539.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 5144 bytes
SHA-256: a3dd9868e94b511b59747837d74383b2c8ee8a929192a6de3f6543341beb135a
font_01_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 12036 bytes
SHA-256: b30a1a909d4313c736b63806b41dd96c788f2dffeda3bedffb3509400b44d1a1
font_02_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 16112 bytes
SHA-256: da133098c8ec00180ce5fe37c74b807b143adc5860869a2f7b6211e455203b10
font_03_sfnt_off000137b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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