Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb356a364328c7d1…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 01:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2862cf6a0ddd3b19c5d813a2da7fe9f2 SHA-1: b947f9e55d68392419784d76e650c6ff5e2f0100 SHA-256: fb356a364328c7d1799b8f121d3affad15be4386c758b30a598564bd8a364e59
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external resources, many hosted on compromised CMS upload directories. The primary purpose appears to be directing users to malicious content or further infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=moola+bandha+book+pdf PDF link annotation
    • https://pasarantogel.com/contents//files/33094143353.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/dopexonezusepuwuwerofo.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/33285223287.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e7809210---nipefukagoxapuferi.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/rivuvuxagonose.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eda48a31d---kezelota.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/sasusekizokazaselemix.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/029cd95e27ced3259d709679d6353780/97355452354.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b630895ebc5---motimiroxifon.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b99727cfbe---tiwigiwexinekaru.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mapudprio4vts9li00qhtepku4/45556379790.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/konami.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160729defabdb0---89370940867.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a19bb178bda---megowitok.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1q6iu1kvfk0j1b6bb59gliac40/vifatedixukoruzipeju.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/befige.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/xutezurajimugape.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/mozogomizazolowabavew.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/5245435175.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/52618768034.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/7727201608.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609590ca90d75---xegasomojixo.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/39924670474.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 10228 bytes
SHA-256: 42a5023c4a1a73b86c93bfe059076af7a289ceef9fb90be7d8294283577ba308
font_02_sfnt_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 17716 bytes
SHA-256: 253d5c40040e58ef80bbe0c30b71a580c3d7d8bd687025a77683c53a8861522a

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