Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a915e8f0eb940e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 00:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3de1fbf37de7738455afad75b6dbcb01 SHA-1: 0f19575c5ab558917f8e7918b8f99e2723acb379 SHA-256: a2a915e8f0eb940e1b6aa60fa194536b73c43a802f8c4f2ca9a894da6b54f5a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to potentially compromised websites. The PDF contains numerous embedded URLs, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the embedded links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a malicious intent to redirect users to external, untrusted content.

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://inwebjor.ru/uplcv?utm_term=can+refrigerators+be+laid+down+for+transport PDF link annotation
    • https://baxsporthorses.nl/userfiles/file/44380239603.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/sigat.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/vibobatefadonuru.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/wuwokadexaxojisitukej.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396c838a2dd---gavefimutivazabomela.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/65421527224.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/katujoxisitotunirojufab.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/furusojifutevofaris.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/92442787197.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/3570358072.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/ramajokoxenupunogubupef.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/56089257190.pdfIn PDF document text
    • https://interconformity.ro/images/file/jibusezigezorekakekoxu.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/40044617861.pdfIn PDF document text
    • https://architektor.ru/uploads/file/gumonudujazutumonuniduz.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/tulurebebiletetukogikofa.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/elnmahcu5d74r00dhvjhtbqgn3/bomijawiwifibuzovujosoj.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/memirupeg.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/44375460377.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4d32299d---turadasimigafim.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/visinifolovabukebom.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/miragudulejibupurabodu.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_off0000aef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF7 10932 bytes
SHA-256: 6efd6177a9b266c7b2e4c66c89ee73754ba7c0031fc0b7eeb2cba1f38aa4f41e
font_01_sfnt_off0000c812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 15776 bytes
SHA-256: c046b07e494ee92731837d0c4cb69d6754ab3e618224990b14aacdc8c006d3e0

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