Malicious PDF — malware analysis report

Static analysis result for SHA-256 459fccbfdbe70356…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 06:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc9d3158433ee766c10b00361bd7fbbf SHA-1: fa865cc6d4173c828fbcee0cde3fba115e4523d4 SHA-256: 459fccbfdbe70356a60a432096c27802e7eabd173152642b80d7bdbf7756b5b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to host a link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=notification+bar+down PDF link annotation
    • http://schodylux.pl/userfiles/file/74273233442.pdfIn PDF document text
    • http://pskov.agisinfo.ru/uploads/content/files/badadafatapuzigikevikubad.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/subaw.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3ffdbd407cbc5699df86586474746d71/zilugimoporaxaxapam.pdfIn PDF document text
    • http://xenangheli.vn/public/files/gesumokixemefejaxivinore.pdfIn PDF document text
    • https://salwangurugram.com/files/pawupinin.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/41011704236.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea2e30ada4---geporefeguwukerupo.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/29789981149.pdfIn PDF document text
    • http://e-district.org/userfiles/file/xexenodogajuju.pdfIn PDF document text
    • http://teraval.cz/res/file/17264151907.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210911_051312_6909.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/30596020313.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/38319954544.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/7d7d3074ebb92d9da5ce4bc86255b95f/83700801839.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/welaf.pdfIn PDF document text
    • http://hk-keber.de/images/file/mexujitinares.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/74242474483.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/ginukajevimipesawed.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/57028698362.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e57d1ceddf86c5580eaca50c3baa9d81/vibekuvuwi.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/90100173039.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/pabejimotosofenusad.pdfIn PDF document text
    • 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_off0000afc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC5 10328 bytes
SHA-256: 3dede5e1415542d70c755750f952c71401a58d9a855e8eb73cb42738a3724861
font_01_sfnt_off0000c73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 16344 bytes
SHA-256: 7455a4d0726be491368f6bcbb4835af1c20548ce7ce6fba0b29ebcca4398afa4

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