Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ab3c7fc24185c5…

MALICIOUS

PDF

81.1 KB Created: 2021-08-16 09:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb445d55dcf8815a83b61aba38234b03 SHA-1: e5a5a8076bb5666c6c47333dc6d31aac0eae6d7d SHA-256: c6ab3c7fc24185c57859ad7c65d21de9c3eff9a72e9ea1ecc5e7671f59c2adb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of external URIs and the link farm structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cructi.ru/uplcv?utm_term=partitura+cumplea%C3%B1os+feliz+para+flauta+dulce PDF link annotation
    • https://voyageaventurenepal.com/upload/files/88846192849.pdfIn PDF document text
    • http://bakoca.hu/files/file/feramitaf.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8mvk35fnmuk1nplujgbrs6cij5/fatulunasefag.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///83538627475.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/57972009417.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/32038224569.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f0fc1e23a448356b64442826e5331ffa/wotilapeki.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65ed165901---wasusatisad.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6b15c39e77860b1761208b568cf8cd11/10057220857.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ec99e6ca0a7c7fea48b53edc58542efb/47663436264.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14348f1a0---87364504656.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/59b3a3ec35f02733741faf977b1484cd/pidirazupu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/23e969ed1d57b867e74f2046d9ee1608/buramiliwerunitok.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/17739831651.pdfIn PDF document text
    • http://rurisnet.org/images/file/79572914786.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/dokosopovadifumex.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/19314299613.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/18259105771.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/30632251631.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_off0000d04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04F 19764 bytes
SHA-256: 7df622ca99802d087fb2f2c7b92c2218ebe83df22dd8bd31fcd3b3c7c6964ea2
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 11044 bytes
SHA-256: 57c3763ffd8e56c0c0f65573e691f7f915b941340b4a8c6727de435fd34b0dc0
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1