Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eeca025eeb165e9…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 21:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba573b2b82c51f1fdf62557281e25ff5 SHA-1: 4d604cbc09e11daffc6bcd68d9880cf8fce55e87 SHA-256: 4eeca025eeb165e94efa932bfbac7138fca2850745f514827dd902bca88ba536
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as 'pistant.ru' and 'vidiniaibreketai.lt'. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=android+studio+record+audio PDF link annotation
    • http://vidiniaibreketai.lt/userfiles/file/71633931898.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140408d7f157---mopamixi.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/josefaporikusasuvoviw.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9fad8923a9d5de0ee3deafea59430e0e/95662328769.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/wimuwefuku.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/gesokanokudefixufika.pdfIn PDF document text
    • https://businesslife.com/content/files/53545608814.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/22044737833.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/45684699856.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/libijatibisotejonuva.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e21244df7---95004709475.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/lenuzagutapaxujiretelog.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/69055441167.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/41146823841.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/54413140406.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p75t0mjl5n87s7uddtvi25irv3/luveruzekiwogesemexekezij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320a647a9fa---8931537912.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/48857235330.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/19112638288.pdfIn PDF document text
    • https://12shio4.com/contents/files/6098636767.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/jeripel.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/fevadisapivutebofutoguf.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/janadonetabafuf.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/gosuronotijur.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/16898161082.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_off0000b849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB849 17172 bytes
SHA-256: 096ec2528bd14e450c26a0dacfaacf3fe8b4154c49cfd68e17c21351d435fc3b
font_01_sfnt_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 10400 bytes
SHA-256: df72d00325227721107ec0e69e443a64d0b1b8d2e6cca834b2537cad87531d1d
font_02_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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