Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe943cb459d4c36…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 11:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9a498b8523a91a9b325eb804f2b8505 SHA-1: 2e00573a2ed6c5f0a41169b03a4f445f2538d5c6 SHA-256: 9fe943cb459d4c36b00fdab41e4c8ab3fcd3982150e26b555c4862cd83f93a2c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable or compromised domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs strongly suggest a phishing or malware distribution attempt. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://abyway.lv/images/ck_images/files/59720207516.pdf In PDF document text
    • https://matraci.info/UserFiles/File/75461237652.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/dopodagusexarejiw.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/38290917066.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/87148310815.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/28671728978.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/54812827422.pdfIn PDF document text
    • http://basisnomor.com/contents/files/16396548071.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/kofus.pdfIn PDF document text
    • http://elitk.ru/_files/soterudikumukemiruxixani.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/26626255706.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/23234998304.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/91893900821.pdfIn PDF document text
    • http://rafaelokazakov.com/file/43072085715.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210907122701.pdfIn PDF document text
    • http://i-physiology.ru/upload/lubibabogomog.pdfIn PDF document text
    • http://robedecreateur.com/img/files/79887072768.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/pawaloriduk.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/28143269740.pdfIn PDF document text
    • http://aurora-c.jp/files/files/93782354975.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109032110132885.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/jalivizilo.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/93b69818c0a088b3cd6685e172edc598/63250909943.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/sazafuli.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7cf243c04e90af3b55e33db4ebec721e/45742389160.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db41ee3d8---78670714995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+online+hack+pcPDF 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_off0000d298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 17928 bytes
SHA-256: 56d1c8ab6cf619c032a6c36620ca6200038200387d4d9afc75d1acd23ddf3cd4
font_01_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 10336 bytes
SHA-256: 21e55fb50fdbbb619f46c1d18e3cfecc0bff4215906cc5544a87e895d8222efb