Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bd25a460083876…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 03:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d3326145cf301bc00b0c89881b5e78f SHA-1: 8a586cab7e867d6088fe8e98ade30f9008d1c72d SHA-256: c7bd25a46008387615491920a9d462b6076c3bb2090c0f5004244b866df68d51
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body was unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/79545717863.pdf In PDF document text
    • https://sweetburden.com/upload/users/files/89636018882.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4a839a02406aefaa4939a5c059aaf979/pububefetukaje.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/lupizeseza.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/loxetijiwu.pdfIn PDF document text
    • http://snft.ro/media/file/91593338520.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/89067161006.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/dutubeje.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/52540130323.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b96e1af075---tonapimusetedekivepilewu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/467a0c1236171f9e9811e2dc818125e0/86332407678.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/gokojoxumudosezetarugo.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/jigiwapivowifuduki.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/zijibegijaza.pdfIn PDF document text
    • https://architektor.ru/uploads/file/69290781556.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/fanipamavoraki.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/pibivewixubadelow.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/xobip.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/zigufonabokuruvaden.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/32a6b438a2b592e5eed9d9d538190b8c/zijitaseduxogo.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/26846221895.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/batalogekufasabogosif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=on+a+hill+far+away+chordsPDF 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_off0000ad84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD84 14392 bytes
SHA-256: fa9f15e3e3e0df21de10c0622cb2d917968acccccf933596abc8c93fa82a5dff
font_01_sfnt_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 10568 bytes
SHA-256: 9a301fc4a09c1869dc8c3366eae5075a890f66d14224d17f6543ef7502c4b78a