Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa048b8cf42eca9…

MALICIOUS

PDF

61.7 KB Created: 2021-06-24 23:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: bb6694080c88aed5adef791dcd2195de SHA-1: a824076c6e9986e8c73da319bc7ed455a1d2e5f2 SHA-256: 5aa048b8cf42eca9fbbe2fa8adcec9a39670e03b1916333b13b18a0fe1ed89bb
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 0.9998

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://crysiq.ru/uplcv?utm_term=stiga+snow+fox+manual PDF link annotation
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160976c1895f4c---55196352473.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16087c0ed5e60f---vebekevikabasijitekasanej.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/bemolorixasawolemakija.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/p9uj7lsq5pbln79e5qo9p9q4e0/dutetawinise.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/juvisanejutukajuje.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/xufogejadiku.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e6c4ff5207336367c5364ecdf68fde35/55619090774.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082027ddfd4f---69878373314.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/mijavatak.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/4b2adc77fe0a1614cc9c7a969d5e66bb/lezani.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/sikukatatotowili.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47ae8525a---88301672637.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8f69fc0a9c99b86b9026dd780342824b/37696866164.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/62972793682.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/didezaluzisukofufewudeled.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a42fe3f0ab3---25340731546.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/14591778798.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06e0d1271f---59682520512.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB244 5256 bytes
SHA-256: 25b77534fd721099b5fc9aaff001a930886a55cae3d17750f62117eddd2e2afa
font_01_sfnt_off0000c434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC434 11716 bytes
SHA-256: a1beb7c9273f4178af28594cfe0e9cdf8ddf5de0c2b5dd70b6ac0f8fcc53fc84