Malicious PDF — malware analysis report

Static analysis result for SHA-256 9507056470aadea3…

MALICIOUS

PDF

73.5 KB Created: 2021-09-09 10:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f85ba4aaf62f306d5f8ee224118695a4 SHA-1: f59eb612c6d96c52d9ae9381e95913726d123943 SHA-256: 9507056470aadea3dee77e7b95367a3d7ce3090bd7c97fe451f1a5eea19f2a83
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/zigidel.pdf In PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/sarutinorujosesobivo.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/8244398842.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613981583b386---pugijefeba.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/nizutanukivikakadunetov.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394d364a2af---nuzenemon.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/686295688.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/mabilaxev.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e588d149a8020e5d43d9a25c3d9fb59b/52033055862.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/3537994460.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/kabalasekipasopemupidogo.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/wanefuxoraderujajiraz.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/57989084069.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/jarolisafofiz.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/lewosogudorotevonud.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/863bac45b090a5854219ef1cdb49a820/mawugus.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/91746497816.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/pujerofo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613529f3e74b0---puxeburomemubifufawakeb.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/61425910562.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109072312237196.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210909/file/19889661336.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/15145253164.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/62602041498.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/butejenogulazonajazed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=arma+2+free+cd+keyPDF 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_off0000b464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB464 20476 bytes
SHA-256: 28fbdbb3c0ade70dbb63b2e148910d5c642073fdffef56ac563d09e108f2d20c
font_01_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 10316 bytes
SHA-256: 317bb8d18b3d41334f4dbeb0c60f6e8f92c31f580e79359ac3bf116b7ab3e732