Malicious PDF — malware analysis report

Static analysis result for SHA-256 28df547ca8df084c…

MALICIOUS

PDF

100.9 KB Created: 2021-09-05 01:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2fea8797a53dbb3c89a4f10751ff6e0b SHA-1: d878049cf52e1d462b99ae1f66afde4c5e8d1b0a SHA-256: 28df547ca8df084c912e8a0d2b592d68f6cc11c8cb6c629524c5b9dad92e26d1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The document body is unreadable, but the presence of numerous URLs, many hosted on compromised sites, strongly supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d4c2c1697---88909420091.pdf In PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/e66f7e8b43952e5f09c99864f54b7b79/ralofomijojavemazemapajow.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7847c1c2---jimurofoludixamafot.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/5048957743.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52449401166.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/muwimuvelafaxetamixujo.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/viwenegofokazobar.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/7721089036.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c8470f86c---44339987633.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a67a2c1236---gedumuba.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f181e5de341---kidokisuba.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/jisikegoketekigaduwupa.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833924d93e---68767684837.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/19515878514.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/gegepinolafuzi.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/besafodiziv.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/firugik.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/vetaxebiveme.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087157023c63---peroteropulivilazem.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcae08e446---bekeretinenerelobiderozuv.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727761aff75---73509253354.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/62075867165.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/quhnuqpc0htl85kltchnad619r/60401075568.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/69349533636.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1858aa846---texuxasilakagapavo.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/65246546558.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bc1e87506063d0a3c8041f8e4551160d/lofefume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=naturalistic+inquiry+1985+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_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F23 17208 bytes
SHA-256: c9ec4bf10d9e61d96282a7241d359b116ec7b7470f29e40c7cab15ae2c94fe9a
font_02_sfnt_off00016b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B68 11260 bytes
SHA-256: 3e7b5a68fdf030b48e1c9cd180f7e97c20bc8438c47bf5104b431a44a46f72e4

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