Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91ce67d9c16faf0…

MALICIOUS

PDF

85.8 KB Created: 2021-08-21 22:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18651cdef83e3f3bb8107f2c4970d6d1 SHA-1: ca9fcb9685610dce67f87b2a0e94840e891896d9 SHA-256: e91ce67d9c16faf0311f65f7799a1cf8840d822ed044f29d93d66ea7af28629a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including one pointing to a compromised WordPress upload storage, suggests an attempt to distribute further malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://files.ibiza-ferien.de/file/29611049379.pdf In PDF document text
    • http://maciejabramowicz.pl/upload/files/file/judadekuxujodo.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6e024ae06a1302dbc48d068dd6c1da9d/7897249739.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78bc59a9f1---65377583194.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/zukekepefegakutimapuzaxud.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/27638026322.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/34d7f8f997f7ed8f1f9d156588cfd030/felaresubetotebu.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/24287345144.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3974ab4d4---32720168060.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d2df39af---18936945591.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/powebatedidexomexur.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/54208996068.pdfIn PDF document text
    • http://kleiberit.ru/files/file/27874004592.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/vorosasitazoze.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/votefeger.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f954480a90f361fb044a2bfe57a1ccbe/lijakoz.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120b24db821f---72656257380.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/10cc8e07e5704ed2d3fb9fad759c6002/xonuputewidagikipilonijuv.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b284ec32---vivixeximug.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160739ae36150b---liduw.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/hluak5rll1j9a3cpd39520huk0/ranelidar.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210817_DFECD84C5F63A4D7.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4e15beb0---50718737435.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/todedovexoxojutebe.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/gogefavog.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tlqfmqfmn6j0dk5jd10g146ta0/rusigufikesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+pay+income+tax+online+revenu+quebecPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 11112 bytes
SHA-256: 39afe578e8bc356e5d18eade5342e20075e6f37c5d6f8b3026cec441897690e3
font_02_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 16780 bytes
SHA-256: c5bfd4e7d59bd216c80ca770cf916b528a187859d2920f9f8ad6843f0e5a0101