Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10904757f8b9697…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 21:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5605d07d13da553c5afed012082a2231 SHA-1: dd0f2830b2757d6a373613880647775be8436b65 SHA-256: a10904757f8b96976af83a06d43d232e0fa33d51af47c840f15c59e2d278f554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crysiq.ru/uplcv?utm_term=canine+ear+cropping
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/427397140828311b70b8edb5184a6267/metimopopixi.pdf
    • http://waukeganeast1980.com/clients/877304/File/tekomijobazagajisewezidi.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6b0dd1b1c07ec8c5eac67cc2896bb2f3/zaxumirumutedemobo.pdf
    • http://charivne.info/images/file/zerugidid.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608729729f619---powikuk.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab7829a8ea---zatafutuxu.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2hdk5t344u4vjtjv34dequoku0/bimafatupadoxu.pdf
    • https://pmms-online.com/assets/file/82926166444.pdf
    • http://plkorea77.com/ckupload/files/17428693736.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/77345ec670a7352b83a3b5821cb38156/muguxurofebun.pdf
    • http://2ds-creations.fr/userfiles/file/zubumivopefunonujule.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5d006ce9b03c7b0004c73647ca8fe774/suxudi.pdf
    • http://global-leasing-management.com/uf/file/21635204853.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609be63333946---4989201314.pdf
    • https://elnativocoffee.com/silver/upload/files/muwazidupo.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e5768143fae3852bb00dceb40fd3e142/vifasenuvedijetugove.pdf
    • http://kcde.kr/userfiles/file/11600395366.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/29667d547ab614070ea4c7548ec16956/sinavunivuvajusito.pdf
    • http://jdhs77.com/clients/58520/File/pidadoragovegilagafijorod.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9317a6681eafb670912d6091b575765a/26737432314.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rtcqbvp6tv9t4m9cs3e1rfqf49/zukiwenagogopape.pdf
    • https://micsys.in/userfiles/file/wivowufilagapojugajir.pdf
    • https://alarrabnews.com/images/content/content/file/rawodijubiwugiv.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b215ce66e65---45997146330.pdf
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/86453435613.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf95ac955---nirexetirumiwo.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_off0000f7c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 16792 bytes
font_01_sfnt_off00010fd8.bin
f6a7fb8f455f38bc3aabb1369d577266794e344be53d90507cedeab66c3a5e23
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 10268 bytes
font_02_sfnt_off0001270a.bin
f21a0b5197cd72d644db53613ec36c57736c5bb3aa03a5b9ab7f4478faa99403
pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 17068 bytes