Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b45028f319f5f93…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 13:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 436e8d6d1b48726dec42ba511756352b SHA-1: 9f1eb0b68cd7b1fe77f30d72c7deea03b395fd9a SHA-256: 8b45028f319f5f932046fdaa9d110bfccaddf1beda3da81b00329209d97e63ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm used to distribute malicious content or conduct phishing. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078224a34c51---60903173411.pdf In PDF document text
    • http://aqbnb.com/uploadfile/file/46212360503.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751b3fb5f22---7167766501.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/86266522816.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/17q3ctjh5rpod4che4v1cipbjf/teliguxaxofat.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/22527851356.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/bedatufiwajiku.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4213b4bd8---36955450325.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21fec8e551---mizojumipipevubon.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/26874018909.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70314d3f8c---zapitodizuvuwelep.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/50676186220.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/88934535575.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210505101005_666878033.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/s5kepmhr6e8is830frblr3kbnn/ridaf.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/33475068250.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6d7f9bacf1279a0e2b6773eac190c7d3/88255441680.pdfIn PDF document text
    • https://areicon.com/images/file/xesolamo.pdfIn PDF document text
    • http://salwex.hu/file/104832456.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210806011035.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021852255428790.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/80375232859.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/tobebewevugenigunataref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=c+programming+language+tutorials+point+pdfPDF link annotation
    • 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_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 18128 bytes
SHA-256: b9e561557c63cf6805b4159fdc8aee7375ccc379fa5deb170be09ecbf394c563
font_01_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 10972 bytes
SHA-256: de171af9fb3232b630a9f530eb40524af26e4c98a1c0467eaa54d9325285bf91
font_02_sfnt_off000139b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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