Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dc8b6770d1020d…

MALICIOUS

PDF

110.0 KB Created: 2021-06-30 21:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d55fb935bb019eed92c15d40b5014d33 SHA-1: e58b58ca2e20dcc715058e45c2e30bd86a5f7038 SHA-256: 28dc8b6770d1020dfbacd7f384cf5f14418236ac3681e6d4f4a1ed83285509cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://evevoyance.fr/adh/.-/file/rapokevotijegasojazas.pdf
    • http://interno-kazan.ru/upload/files/dimimujelesudatimetenuk.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/62a077873edaded19c7312c8a98c1ca2/41165790050.pdf
    • http://accessprecision.com/userfiles/file/kudinanawo.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0c45b1340---duzoruvujow.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c859f9ea7b---19901200857.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/46394035188.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/91455191047.pdf
    • https://paperland.bg/uploads/file/39815969628.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091131f501ad---59225471784.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/wurofokaligawonodet.pdf
    • http://codienlanhminhquang.com/upload/files/92563148266.pdf
    • http://dush-kz.ru/uploads/fck/file/tugidebetagaxudi.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096d08fc1df3---73313603201.pdf
    • http://nessium.fr/userfiles/file/valutovapugopufimaja.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/bqjm73skme1orbao0pdc791d35/mikubuxupobibemadiwulo.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608059266cb2d---60754023820.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28415af34---43896594771.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e190d3b04---19058806115.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/59225059490.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c6999d263f4db854137aefbaf502dae8/49277875819.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=f+test+table+for+0.05
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000152c1.bin
c089882d69a0e70606b33573c64f6460f20a23aad68fbf01845d8b6737784e86
pdf-font-stream PDF embedded font (sfnt) at offset 0x152C1 15708 bytes
font_01_sfnt_off00017b05.bin
774422a7af503bc4d43c7f9067815288cb5a80d4dda3153fe7773a5bc34f8eb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x17B05 10448 bytes
font_02_sfnt_off000192f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x192F3 16792 bytes