Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a95065735a2bf3…

MALICIOUS

PDF

88.9 KB Created: 2021-07-02 05:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0e3e26594dbeea2904a2ef5c087bdba2 SHA-1: 950c9756d4c8d2c0d2e850f14363cfe5debc43f0 SHA-256: 16a95065735a2bf3260fe4a455142b20ced1098912804eba49c293e27b579f1e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farms points towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://oniceh.ru/uplcv?utm_term=top+the+notch PDF link annotation
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/evtavc71icip1o1vq5i3fvgge1/lalepofotajalugoworomu.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/lopijuwedugeja.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210508082321.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///32581142819.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7df0bfa663ad5dff88afb6f4dc317781/gagoxiwulodi.pdfIn PDF document text
    • http://valeneighbors.com/userimages/nolutuvolaretekanabolefa.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f818c6a695---nijedipadiwopifedexavob.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27ea1d246f---30723964079.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba84062c53f---dewiguzixuxovakog.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/93tfkfv0disjlspokr6nlshjf1/2659308956.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/18330016408.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/wosagunatugidevovojodabum.pdfIn PDF document text
    • http://atomleasing.ru/media/File/nabowaruru.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d24c6f72bee---mesopodikinozenaxirogo.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/dixabawezabemesejajavixu.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/fmerlsstpn8l26r43vd5uk6bk1/25296186082.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dce9e437e---rofek.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc379c9538---pofik.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ddcec821---bufidefiruvizatefi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/98ae14aa818f303a23470be39b364de7/85529076031.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/36651033140.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/kidovopanesoza.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011a84.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A84 20252 bytes
SHA-256: 9965803bf169288097060d5e7b6d2945dc81e4707bfb1df6c2265c98c8fe10dd
font_00_sfnt_off0000d2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E7 19124 bytes
SHA-256: 021fd25eb076ee233547ea63ed0d3a1a06fd2028950f7021a6b9f54e68767416
font_01_sfnt_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 9868 bytes
SHA-256: 0e9caa121f757689e1b6af5fbb57cf0710c7aa2467a07dcd0757502ec510dc25
font_03_sfnt_off00013cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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