Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5a96ce07dbdb16…

MALICIOUS

PDF

77.6 KB Created: 2021-06-26 02:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cd13ec2c95e5ad0b0c917b396fe8cb7 SHA-1: 955146db27ae2981de4372d0c51d66cda48c5265 SHA-256: 6b5a96ce07dbdb16b081b8c8cdc0241ad042160b42e4d9e176ddca46128c7c98
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/01d29b23dd329bf0d2449658d366db00/fojebovuvaja.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2t5pum2oghs7dlt45oc4tbfql0/kibipizugipokizizate.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/xumukigevubazelufepux.pdf
    • http://mgtofubbq.com/uploads/files/79555690111.pdf
    • http://librojuridico.com/aym_images/files/22301972536.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/99463174762.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b515b2b684e---xajazudilidijol.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7a2b1b0e---wunebukovip.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/586df59d6b7b9449bcd8b4c7ce270585/kojoz.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a484979db5f2b39fae3068f67338aff1/litisozuxir.pdf
    • http://ash-graphy.com/userfiles/file/84108424914.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/871837efdf311eb6341efb6dcbf1cc9b/tumid.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7aeba10c6---nimiwatalekalafifa.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/63adqqjgetkcbpf63dsnml5rd1/vetefunufa.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3af04fd00---57007342211.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/63599642811.pdf
    • http://www.allatpatikapecs.hu/images/file/bifijed.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nj0e5lk4iodjo4tm11teioipvg/mikiza.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16086f79c5d03b---57880532013.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160be02264b427---59049965358.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/68371661305.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=overland+grove+forney+tx
    • 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_off0000cc9e.bin
512182e40a788990d64f23582ad6abc734061000dde6583c051b6c83c513243a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 10576 bytes
font_01_sfnt_off0000e4be.bin
df24e3602eccaac428b7cbfb2202fb70832d1fde5301fbdba617c5d6ec9221a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 17056 bytes
font_02_sfnt_off00011166.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 16792 bytes