Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3ecd6541cd7c8c…

MALICIOUS

PDF

100.2 KB Created: 2021-09-03 07:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0a3a1fca6448a169f47c7e566691463e SHA-1: 2b6a56d68e6f0286d1fb8cc9393289fe80423153 SHA-256: 8c3ecd6541cd7c8c56c979bbbaf2b174d393d45031ae334eb2f417bd896e3846
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous URLs are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://relaxbotanika.cz/ckfinder/userfiles/files/63027928913.pdf In PDF document text
    • https://eliteplacementagency.com/uploads/files/93712070402.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8caa4b88c---99198248248.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/27vblf01rmrkp25l2h828tqjl2/23803778718.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/gawodalelizasuposa.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f95a5793---97009377427.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d8d9c05c164deb1e426742d8cd72096f/87167993589.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d56250161c18c241bf2522eb9f5bd485/xijidozijazebixidefaxur.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/xebosisojawewixirib.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/famamitopewebebepetoti.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/fikapeladi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16103048571f54---51084573564.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/76409099585.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/oa7atdb3ehh3pte82h21ivcat6/nufowefuwetinijerusigos.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/vegekoxekiduxu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1qeoj48s9t7ntjfm53uhb1j2ro/79293792319.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/rexiwuwajulizulafijiti.pdfIn PDF document text
    • https://jotelek.hu/files/file/vupadigo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fcfb62e61---zapixinamazixaxilad.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/97858799071.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/g550a8vh5mg6f8srp25t7ek1b5/sunuwuvojagad.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc7b1ec8eb---69169583071.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/rasizejozaxuj.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d1def4f6---86747185128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=define+livelihood+pdfPDF 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_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 22644 bytes
SHA-256: 472157338c111784087e2c6bd4a94a04ec5a62b221de902a31a94224a791c775
font_01_sfnt_off00015443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C5A 10132 bytes
SHA-256: bb7ed172093c687cc5e40db76a9a1b257d25472cf2f26d81cfd82ccc682a62d6

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