Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ba1f05ae5a1482…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 00:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72f4fe20f6bfa85fc7af6b6677bcd9c2 SHA-1: c537b9928b801f08205b49f4e5bf5010c48cfb16 SHA-256: c0ba1f05ae5a1482f00c8ff9d98df99ee1cc01ad277829f50070057173642c36
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm or redirection strategy. The presence of these links suggests the document's primary purpose is to direct users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04eea62624---75418619606.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0v4bp15amvt4dcnevsv026569s/nutulilipomelumazuxepuxut.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/52417738913.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e614a976f---54936691380.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/jidigowafefodixebavinofik.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/38392026993.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/q3o2vspicsb0i2i3kirtnl0jgj/sulanizoxidasasifofivez.pdfIn PDF document text
    • http://erex.hu/upload/file/susewobiwavoxerifexal.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161243d4c8f8b4---labajigoniwawekunu.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/fezurijapogedafuzefolepo.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/87167794137.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/69145438295.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610401dcccbd2---pepanabatoru.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/18129797698.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/57101222435.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/66736490781.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/35112244900.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/36073286934.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/86269539307.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dadc58bfc---loseverele.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/lifudalofeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cable+current+capacity+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_off0000c439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC439 17344 bytes
SHA-256: e8a7922444a4d7adb1555dd356764f39e551c27239ce67b741c3aa66134ea76b
font_01_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 10708 bytes
SHA-256: 74d5caf02fca88b782161c802fcca1b9ffec3deadb4f31bb2ed1a7b9df645f64

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