Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7722df2ca0ec38…

MALICIOUS

PDF

70.6 KB Created: 2021-08-27 23:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 066b492ecb0bf1a09421faa77b7e1bfb SHA-1: e90b6a4f1a90dc2d78e8576de803eca99e8e8b7a SHA-256: 0b7722df2ca0ec384d9a0b0c0691bfd5b8ba74e50364fbcf9e0623ca924d2efc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or spam campaign. The presence of a link farm and the use of compromised CMS uploads are common tactics for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://medicaldistri.com/ckfinder_files/files/fixosopedizaka.pdf In PDF document text
    • http://banghetretruc.com/media/ftp/file/pajusizawobapet.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c18d88fc4---gafebaxoruboki.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/15655333390.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/bunenabof.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/76358146032.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ebaf2e7056f4581e54654c3e554cfe56/96235972448.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51cba80a5---44050513433.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c830eb4f3f---549787113.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/nizakaponiw.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/fizemo.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/34112087024.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210827_021230.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd68f71d92---befupetususo.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zurupizepazanebuzut.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/37949180982.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/jetezusegonunajif.pdfIn PDF document text
    • http://dejede.com/userfiles/file/1403767316.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/93939853766.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/97516882438.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/kififiranomadovumigodavi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612096a53b7d0---28098409753.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///93475615362.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e053ddb13d5---98436196205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+win+the+high+stakes+gwent+tournamentPDF 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_off0000b790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 10776 bytes
SHA-256: 5f8789a5ea2ae3369a1ab490a01d29863b1ca85ba7c6f64e2e2f33cdc15d062c
font_02_sfnt_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 14340 bytes
SHA-256: 8058bb0638e6cf42bfa73ca2b50cf80a5b4284bf08812aacdfdfc8bb08705711

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