Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04752c0ceabfe95…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 00:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 66ef1154a65a67bb4857975acfc00193 SHA-1: 85e893363ac3bf36a6bebc89a363e2eaf47b71c8 SHA-256: e04752c0ceabfe958b38ae82025f9d2e842fe5799b0a8899cc65b8225f8b3ee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9964

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://huntic.ru/uplcv?utm_term=invisible+man+short+summary+pdf PDF link annotation
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a398574f715---tagelowasajokabitel.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/togavitikajasovozaw.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0269116d2f9288bcd025d5fdd87def8f/zavilomobo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b9b9aeb65---wuxodutobo.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/10340880351.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/61387613203.pdfIn PDF document text
    • http://herve-coiffure.ci/files/rureri.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/59352971971.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/badubegol.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/rebiwawuxo.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062318184970554.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/minerunelikutivo.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c4731faedfbde53c535c25b2391448cc/55008118989.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/bm43c5h7h4h77927jjhkjtbbl2/11567098767.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/dijagik.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/r9odounf3l9s7dg8jitftc3t23/pokosomuzexafajinududof.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0384cbb6b16d8f7aeb465455f6c5dbbe/70236818576.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/nokibe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kk19d73h3ti5cpumofmrm0e7te/5996728794.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102b7bdf00a6---xebewajov.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610a67927530f---76181243005.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070474ab2438---naxufemufigimepomuzepa.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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 11132 bytes
SHA-256: 819c36633a03b68b3cd2531406ab2c2f4ccd3cc428f6eaedc40ee2007c861f7c
font_01_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 18168 bytes
SHA-256: f22f9407d0caa14be2926c949f84a127b2faa627b369fdb60357d014c97d4031
font_02_sfnt_off000123f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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