Malicious PDF — malware analysis report

Static analysis result for SHA-256 716849b7c6db4ed1…

MALICIOUS

PDF

92.6 KB Created: 2021-09-12 14:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3423bbabf04bb739e539f9f31f298787 SHA-1: 1b8f6adfd5f2145e95662a61338d02bc5b4d3b40 SHA-256: 716849b7c6db4ed1f743f835f0699e6c11b34f6bc9d938ca104a61dffc572a7d
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to external sites. Some of these URLs are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=hill+climb+racing+cheats+iphone PDF link annotation
    • http://eptesteplelek.com/uploads/file/54238038734.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/5196742723.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/jepinenezudod.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/gepiru.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/disukasamusuwen.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/tupuwawebis.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5majb1kq9kuga0krvn5khr5dql/matiwixi.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/36241524480.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/sateligenev.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210912_001727.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/gugebaze.pdfIn PDF document text
    • https://iohrp.org/f_files/files/vewefoxizulupi.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/67514193837.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/60764505290.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/136997584.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3e1e94e0---bofexurupa.pdfIn PDF document text
    • http://myesen.life/userfiles/file/navalunelego.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/bitisabatirul.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303a3622ac3---fopekavixodomame.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/jewotafirakitomoxo.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210902045835.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/vijivusexupovikibodopag.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/jewukunamuwajufe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 16472 bytes
SHA-256: 3b3deab9c14be4e979d3b8606594a05e5362427bc922c3167aa1f2aa58d207d8
font_01_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 10952 bytes
SHA-256: 261770a21f2360ed2fc3a676790fe80c6a09d7654967eae61ff1a140c7df30fe
font_02_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 22276 bytes
SHA-256: acf267c62c60b2fb566ee4cf89db8c397bbd83e743e4185be87a1457d8340d61
font_03_sfnt_off00014c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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