Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7883b71cd33a11e…

MALICIOUS

PDF

72.2 KB Created: 2021-06-28 03:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eedff9c7e4f8a9c66639769b999a635e SHA-1: a25eb73ed73277a4a1738f20b0a62af49de4e67e SHA-256: c7883b71cd33a11e8218ef69c3b9aa3fbdbb4a66df0caa9ae6bcc4ae61b25114
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and disposable hosting infrastructure. The primary goal appears to be directing users to external resources, likely for phishing or further malware delivery, rather than presenting legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8893c894c---dizuferamodifiwovubomaxaw.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a37b52bbb6b93ed53a0b90c93f4b7bf1/laripegoderarad.pdf
    • https://kraftyz.in/ckfinder/userfiles/files/lemifadazuwerozuremoxive.pdf
    • https://jotekonybakterium.hu/userfiles/files/mamobogepedo.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16072b83f598b5---xevawotixegikalesejedivab.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f398734325---riwoxovokalutoziwexunoda.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996a53a6118---54903786019.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c67acca003845dcb07e8c3c4d0681af2/luludofawokuv.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b08ec9a5ab4---81804589584.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160807e0072319---50544058154.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a0382780d49e85b47b20be5bf669b33e/pakomazorekepub.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/43bd86e9eeacc0487c2cb61fc54bf112/29357014773.pdf
    • http://ankamet.com/userfiles/file/50907310433.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fea18ee9---75877619545.pdf
    • https://alirezamirmohammadi.com/images/upload/files/7849363068.pdf
    • http://aklond.com/UploadFilesfile///2021042823344038.pdf
    • http://alexlunacoach.com/img/editor/file/bepijoxulojo.pdf
    • http://kaupa.cz/userfiles/file/66336264281.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a490403aea5---83768141687.pdf
    • http://rosesrealtyhomes.com/userfiles/files/45814467725.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c64e79caf---gadud.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1248e88519c09a7c2a2f55cb57e1fac4/52670602638.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=basics+of+hardware+and+networking
    • http://janyska.home.pl/_mjanyska2013/fotki/file/25943529919.pdf
    • 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_off0000ba3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3B 16792 bytes
font_01_sfnt_off0000d24d.bin
68e7c78ab6152add44c2f435b2ba2d5070b08b6fd1d3415d1e55608310f0a2bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 15728 bytes
font_02_sfnt_off0000fa62.bin
b5e4713a920920b227a88ee973ca2e4f372c629c823a8af24d23ed9e347aab43
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 10940 bytes