Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f52da8b0cffec7d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 22:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0ab375ea2f728ec360f2e57835613a4 SHA-1: 9d6a52d27948e0e327b9a68bd84a09eef7e5ded7 SHA-256: 5f52da8b0cffec7d5fe7468354cb6307dff749e0a7b4e27b9992f69d3544dfc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b20216edff283e4357d7e077ee2d6785/56677798769.pdf In PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/fupabebavedisokebapomax.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/29579986728.pdfIn PDF document text
    • http://jaatkinson.com/userimages/fowinaxodajipigad.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/rizifiwe.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/1621018859.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/98848412860.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d00d593f1---72235859807.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/23105918377.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/28309722235.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee8dc6c7a---fivixaxepemufidajifar.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/rufobidiro.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/24398170149.pdfIn PDF document text
    • http://surtek.biz/image/files/20150326_163730.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/18128272615.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/37142695384.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/porakamosesifalos.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/bozonafubo.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/66228576653.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/dagesijupodos.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/69057906146.pdfIn PDF document text
    • http://selidbe-beograd.info/files/rorigufad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=parallel+space+64+bit+new+versionPDF 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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 18196 bytes
SHA-256: 43b4def603cd3ec44254fb0e76f55f2a3df16d2da25859500ee4fa6d9a7e376c
font_01_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 10904 bytes
SHA-256: 05dc7fce3c4258720c41e5d610de5917d90cd486de62c287bb3ec61c27ed0bac