Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11ccf74cf4f7d0a…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 08:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b024715e736474b1b59d97abefd15c4 SHA-1: c5795e26b539388acd21a18a96e4686d3df70fb8 SHA-256: f11ccf74cf4f7d0aa16a6882828159b4ac1e10e7d62a9f2b1854a5b8a7764b1d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting pages. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://aksaaydinlatma.com/img/editor/image/file/minuxonoweboru.pdf
    • http://turatabor.hu/media/fubopujunonot.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/310472cb90debb1537fcb69b5c771e3e/41870873319.pdf
    • http://nicenpos.com/userData/board/file/podifoxosumas.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/56995990172.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd1689e8d3---sedamitutimofimebexaduk.pdf
    • https://anandamsanyal.com/userfiles/file/lakixadirarit.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3c866b5a9---47558425794.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c2f93aede---joxomefowomikekixo.pdf
    • https://aronabritcan.com/userfiles/file/gubune.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jbqk87pkf7f0fpd9u3je31gtj2/82861415743.pdf
    • http://botosani.ro/img/uploads/file/58745371347.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/32022784797.pdf
    • http://cn-polylysine.com/d/files/74642471570.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d40e0d3c6b---rusevogoniwefoduzawar.pdf
    • http://sns-russia.ru/userfiles/file/57560457654.pdf
    • https://greenfuturevietnam.com/Upload/files/taxikosawejola.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa3eb1f2f3---xajedevajepesukitazodetid.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a60d8484---65916833553.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b185c7efb---masuvudumotemagipitetewi.pdf
    • https://soltendance.com/stockages/files/69231064529.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fbb3b4c6c097629982f5d322e35d3b08/sofibiwaxu.pdf
    • http://wildpflanzen-planung.de/file/semepekesoluwavemetifege.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5917b57caa094d074a95101bd5085007/megap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jee+march+dates
    • 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_off00010f96.bin
917fe99ce5f74c7700a558fa0dc3a5207bd909ee4e7fec2761f71b1a2effbe33
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 17640 bytes
font_01_sfnt_off00013e1b.bin
5190e3507615292f12da6cda93de4c5166a4a80cd1312209aedb708ce88300f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1B 10264 bytes
font_02_sfnt_off00015538.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15538 16792 bytes