Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf38ca7d1ea420b…

MALICIOUS

PDF

89.0 KB Created: 2021-07-04 05:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2472a4b3d2dec2b381c70ddc4adeb58a SHA-1: 7ca35e1806d6a55685f802f053783de96010c145 SHA-256: 3cf38ca7d1ea420b569e69234713806ad6d115552206fc070601161cf6149d25
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rivaflo-south.in/userfiles/files/nosigib.pdf In PDF document text
    • http://springbook.no/files/80642646474.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/nexomisokeji.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/c4614400e161c9f60aeefc4454ce4e51/51517643254.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/tofiwi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160da9c66225a8---tesavijirojamunonavizov.pdfIn PDF document text
    • http://wamer.org/userfiles/file/21863002418.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ce7a655c0ca6629a87f0065a8204ac88/26681547810.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608edc3c4c060---6353071576.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/63e74b10b1f8b6a8c07bd88b05fca368/gupate.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72c59b880---35853511381.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/kalefufixemanube.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/15fcf28e92fe6f3ba54ddd73e9baa180/dazesigaxebexidobomo.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/18562550590.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/zupasijarivewukemakeji.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4a881e0dc5c178276564f85f6e155a54/15874257322.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/dd2749e4275c939f368edb17d68c51c8/redikivedituj.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/46744004270.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/86477311662.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31dac56c5---90419756024.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ccngu52qpfa9uk193bvjif9h1l/wujodenelezurawavexaravav.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/51181135a02e04206cae710f95bbd561/jizupipepoxupejelo.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/45959911197.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210620_CC70218F798C2931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=aml+all+cml+cllPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001138a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 9556 bytes
SHA-256: fd11a0806aad00ac64e3131fe578a7db7cf23335a845fb49b4df10e0876e0aad
font_02_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 18260 bytes
SHA-256: b3bba669a66fdba6695ec2d4f34cc0fced31f545868750d0685719d1e4033a0d

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