Malicious PDF — malware analysis report

Static analysis result for SHA-256 4337d66710fe8a25…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 13:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b05b47a2b604d709c01f66b0411ea19 SHA-1: 2b703f03070993d21304242b13a8c7cbf8061960 SHA-256: 4337d66710fe8a25ea01a670c5e1e6f5d4ef1e2d816120fac7fc0afc4e708dc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of link farms and the use of compromised domains indicate a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ip-pharma.net/data/files/75507519292.pdf In PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/winokosogogoguvosumakat.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/61572530911.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/34860552969.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16093a90c5ecb1---47424363904.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/49cbfbfab227d6ede123b3006b6cc39f/vufenodezazafovotez.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/5125843786.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/21815215570.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/xanapuxilaxosumejijumez.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/65b3281e470302705c067277de1a645f/10944396180.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/25648739053.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079616d39646---44647682224.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/47601345181.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/tubifaruruvoreg.pdfIn PDF document text
    • http://deltools.com/userfiles/file/doxinenuletos.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611151fc583b0---sofuzagamabenefilodo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e02d0b01---18745112583.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/21274049760.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa72552f978---lanebozunidida.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/98206067868.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/89408354251.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/janowunusa.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/14606814051.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/78905539574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+does+cordial+meanPDF 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
font_00_sfnt_off0000d14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_02_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 23772 bytes
SHA-256: ec8b9da38717d7325821eb76687cc6bfef76b356691cf48f1cdc45f96c3ce0ad
font_03_sfnt_off00013c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C09 10628 bytes
SHA-256: c66af014994826ef926b54efca2c70896862084ca4b6b3be88eeca48c9e1a03a

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