Malicious PDF — malware analysis report

Static analysis result for SHA-256 6becdf859e66f60f…

MALICIOUS

PDF

93.6 KB Created: 2021-07-22 14:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c62b358c6106030eb195b4c23b6b4bd SHA-1: f29772c0e399794876881137a3ff0e3d15470e33 SHA-256: 6becdf859e66f60f681e13ffc69298530ff5b7042a847a58c1b447d86d3e0a5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious links. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links are likely intended to host phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6totgrg403gt5majshuh2hclsr/30677080716.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb84d1c9a8---verexavokesojanuvipun.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/68702735012.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/55dbbb6678744b04c5c800fe2ab6bb9a/41985958386.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac19f446bd5---35792785619.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/u38gi9esnn34unegp382t9c2i3/pukuvovoxekizumojodav.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608849ecdddb6---woxikugo.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/vamisowav.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608897e9c191c---28331027095.pdf
    • http://al-bandak.com/userfiles/file/97644453407.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d939c99b7---sevefusijuzazoxujedeweki.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca26f07832---damot.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/peir4rp7jq7qb5bd16hrcnl8m3/22537537058.pdf
    • https://drosamahetta.com/userfiles/file/purolifomofesufupubifunu.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a98e9df87---67910104006.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0abbea8d---fadenetevi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160942bf314be4---79151616045.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/651ddpgbfetai6rbfct7usaln9/wirefafofetin.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f9553882d---41766693604.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5341eda353---16177775079.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/1elmii1oqqjir43u7le8a85ko7/52062677115.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/dqmej5cojl50n5gop4s36a4esa/wuxutepilisutaronuxisafon.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8ec2080edf012a258f5693fa52d6c4aa/kidoxupebolopagisu.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2acd89557---77980832573.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+chemical+formula+for+oxide
    • 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_off0001078a.bin
a97b4e13ed827400607073fcc6a68ef7dc96d884264d1be7b0545abbc3dba3bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 10832 bytes
font_01_sfnt_off00012094.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 16792 bytes
font_02_sfnt_off000138a6.bin
80e5cacac43af5b59a82856372f4166195865c8af0e2d16a3c99ce4f3ef8b113
pdf-font-stream PDF embedded font (sfnt) at offset 0x138A6 17876 bytes