Malicious PDF — malware analysis report

Static analysis result for SHA-256 903ac1dd02e34c51…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 08:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c8be44e47617aaba95166504f05011ee SHA-1: 892b730eac0a58ae344d5f8f0830a1b922b68ade SHA-256: 903ac1dd02e34c51cc8875237275ff2e492720c9dbc66ddaae1e1665073960dd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

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://inwebjor.ru/uplcv?utm_term=most+attractive+penis PDF link annotation
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160703868370b5---duvedabaruremobo.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/fe30gouprusgtdsm66n06ccm1i/pemidupazorune.pdfIn PDF document text
    • http://d4svancouver.com/clients/c/c8/c8601140a4283eb9b700f388a83987a3/File/dojubebujurenumemosip.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1061789b86.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/89e8733d7a903be3597524b6fa71f088/lugopa.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/29181783516.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/nukes.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b044886119f---naxodepopejeradofu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3ce51a60c---rojaxasupew.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/84957905449.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69990f775---36187918749.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/jci67kmng2sor3h2qqd5ascf51/wutuworavijokinu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a66a8e22296---46032105618.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/61794843851.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/52ku5ncb51dutf6prjt1qk5av4/girakilademaxo.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/fexar.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090505eeb5f9---mokimejifetebofa.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609867d374a35---xaworipel.pdfIn PDF document text
    • http://inse.us/uploads/images//files/pewewisofisuropogajufesad.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/e75d57a53ee36a4395a14b95178f79a2/74463805176.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/affb06578453c9fa034affe77e00e2cf/92008574224.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/nusolajiwinapumux.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/marexijitina.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/55620538711.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ugnphe2vg3k882o9cvqcg69saj/fitesaforib.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

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_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10380 bytes
SHA-256: cd6d76a3e38dd57c7bc3877f833a02dbd674a044ffb890356fd3bd0005259a98
font_01_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EE 15852 bytes
SHA-256: 16fca9063dbea7940adf025fc7edab48ec46102e516c297e794d39615a43b47a

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