Malicious PDF — malware analysis report

Static analysis result for SHA-256 e216f8b10ddbf527…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 15:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f80cf37ac86868b5e0074793f12faad2 SHA-1: 84f9c155747a96a3074ee320aa8d3366249d0d56 SHA-256: e216f8b10ddbf527ec8d276a6cbc1e6038dda750f28fdac9a282994f7264952c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple embedded URLs pointing to potentially compromised or disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kkslavicin.cz/sites/default/files/file/53680070420.pdf In PDF document text
    • https://classconnbio.com/img-jacson/files/sokekofimekenobil.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/29058178732.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/pexopixuvibu.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/69754160042.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075439445a08---54675940562.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/pokesidibamadida.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/78735234809.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59630962131.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/nejirozuvagi.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210809_2D2B21369799868F.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/46577599185.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/duwexivivateke.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/zuzubexib.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3dddc22294cb8b0ae8539ce8cd65d794/wifinamofirubosoxuzi.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108251847096269.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa887e29a3a---31915769359.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/16354e5bba5b2dcda008db968172eba5/vufuze.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db351acdb22---vamanelopakenemakazan.pdfIn PDF document text
    • https://rasorestefano.it/file/77613686576.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/37241748172.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/66019927886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=red+irritated+belly+buttonPDF 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_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 17040 bytes
SHA-256: f76e29f5530b050187ff8adeac49c7f2f92c150d188fba04b576b81bbe97d15a
font_01_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 10472 bytes
SHA-256: 63e88e49ca9f4c6243f625a88b86248be43ce049485449c2d6200fdd91aaa979
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1