Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca0dee0c64a311e…

MALICIOUS

PDF

103.7 KB Created: 2021-07-25 11:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14aafebaae1a83e4888f53df857c334b SHA-1: 8c88f504bfc254efa48580d0075ec19bcc51de3e SHA-256: 4ca0dee0c64a311e8ac71260ab5056f0a72671e8989d2bacc6233af5b803e7a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's part of a phishing or malware distribution chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/lsarvda0tn52rr9r2q0kc7l6r4/zavumuxivaluxab.pdf In PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e342faf47668aac2fbb80d3e0fd5a143/lipakoxutafegiruzez.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210601_0D575AF6C427A803.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/godalixu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9d50e877c1c23f8f5500464c379f205e/meromufuke.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/89669983292.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a07f52327---gunelozalamedudevekane.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/18399936858.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779357b8b4d---solesufiwivoduj.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/83318851266.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be32619dfa0---78552040229.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/c31ad58f0ad1d2940e6b13f08acfed36/zujiseranezegagowixugije.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/jitedagasivadip.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088f401f0121---borazerularotodutaxebu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f11fda6686d4f47aa4cb553083f7e79a/96179671705.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15cd47dd9b---vufetilufukomidef.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/r3rsbkj9049r8sc8suua4e1717/17662900339.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a9febdca---40507424427.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107151824277508.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/93e9673be7ce84d4c7f877cd012075b3/84250343135.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2690a915---82545568004.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb140614544---84808404293.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/nejugofojajepuwo.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/sulovasozojaxuduso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=never+back+down+2008+full+movie+free+download+in+hindi+hdPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000103f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x103F4 22244 bytes
SHA-256: a91a852a15e724dbda21470643e848e2fff96e05df006896688af146f1c5b7dd
font_01_sfnt_off00012aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 20004 bytes
SHA-256: 29121a8885f561d3e5dec4dac1d23ebbd5b3fa5c0345c3d3d86cc9976053acc8
font_02_sfnt_off00015dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC9 11384 bytes
SHA-256: 40aeae05e36448e608e100608b93f1060a80df9067998ed8a5e7bcb1f7a5fa2e
font_03_sfnt_off00017883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1