Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0af274c1353deb1…

MALICIOUS

PDF

81.2 KB Created: 2021-06-30 09:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d07f6a157227a83d2733c3a3c8228170 SHA-1: 86697b8ac4ba969ad9403ed9ce2b75292cf5aa4d SHA-256: c0af274c1353deb1d0ec3d7ec11ff8517e18599239e849d4ff57021969021d4f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to disposable hosting, a common tactic for distributing malware. Heuristics indicate the presence of compromised CMS upload storage and a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ruresept.ru/files/file/kaxizeb.pdf
    • https://hanahana.vn/media/ftp/file/76573077710.pdf
    • http://phillipsbricksalumni.com/clients/56168/File/52432218258.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0485dd465---59815056731.pdf
    • http://www.monts.sk/upload_images/file/daliku.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c1482431fa0---lutadunumikad.pdf
    • http://cerezolorente.com/files/cerezolorente/_repo/file/7809252171.pdf
    • http://busanpc1.com/upload/fckeditor/file/wadenuwaka.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/2f294eac429bb87eddde497a01407a84/29997596482.pdf
    • https://rcot.org/userfiles/file/terizufafederola.pdf
    • https://rivaflo-south.in/userfiles/files/81297919297.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e0241178f54f027d86aedcc1cc246f57/bewuwubopox.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8fjibehnbq069o6q0561ncg112/tebodujebiledipe.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/767a329dcbd9a6ebad931965cece7e3f/23684659366.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bed703845---23014222933.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/jvdjc22bd9rb9pmo942nb76j55/xemujatigalolokupizugibak.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/84806f5b82130669897fd72050bcd19d/tivepa.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607472fdefa70---tojiti.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd781efccc---bigilelopokif.pdf
    • http://zabradli-znerezu.cz/userfiles/file/fefawelu.pdf
    • http://tutek.eu/userfiles/file/rinupebajonugagarevo.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a132e0286e1---pivejoronajut.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8f83c56377a512a3db4c6404fe0c5f1e/kunobedu.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c52b440ad9f---kozupobibulitozofakut.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c5761efe0fbe971891e34259511207d6/39462980861.pdf
    • http://driver-jazda.pl/upload/file/22087720110.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+to+word+document+editable
    • 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_off0000dadf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 16792 bytes
font_01_sfnt_off0000f2f1.bin
6d79b468849e4a3b1857602537854b16b029c1f645ee32c409fbabc9b898d07c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 16660 bytes
font_02_sfnt_off00011e6b.bin
41479ccd53c6fc9a5a00f0b75f880a4e4a8e3b59fe6477fa96bffdac56d0662f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 10796 bytes