Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd346acf5c401d98…

MALICIOUS

PDF

79.0 KB Created: 2021-09-24 11:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 312269994fdb899aa6da981cb960501b SHA-1: 24a850c38c2a8e01bc3b40567f23ee153782a23d SHA-256: bd346acf5c401d9868303ddc143670c875516430e361a384966c3706dff92e3e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URL analysis confirm the attack pattern.

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://smflow.in/admin/uploads/file/rirewitetanoja.pdf In PDF document text
    • https://hondaotohaiphong.vn/upload/files/16371765292.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/34817258984.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/poduwuloxitekifef.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/gedekapesidumulorizowaz.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/newisopid.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/87531236165.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/47207155446.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/jewosigawabuxopudajimag.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/kesaxuzexatesijobi.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/sinabovase.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/kapew.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/75566381495.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b8d0a23b---pirotajoti.pdfIn PDF document text
    • http://keramann.ru/uploads/files/lutipadawisotajazojalok.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4af6107c28ec51b6d67bdeeefe45bb61/25316197163.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/xerisuforo.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/17697208881.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/65168565537.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/wuvokogaged.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/35905576130.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/wasifajenopik.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/jomidakilulukivepixek.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/giiv2l782puh5fas4uec4csuq0/bupozi.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/87262965814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=online+3d+cadPDF 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_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 16224 bytes
SHA-256: 1b1439fbcf8a8a24be235e38d8430318df937a5185a3c1983770ef766503b278
font_01_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 10072 bytes
SHA-256: fd5bff325a03ce57b6d9a489ee48c3c511cbee885f7e27fe682d55de11282156
font_02_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1