Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d6b0b505876155…

MALICIOUS

PDF

93.9 KB Created: 2021-06-28 03:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82fff6add1aaf4a865756bb08f138755 SHA-1: df0dfdb91f41e2c18e2f569aefed0a7655e9b1c3 SHA-256: 39d6b0b505876155fad7b426b34f9ba5237056e665847715f874b63ce1b63805
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a multi-stage attack designed to distribute malicious content or phish for information. The presence of multiple distinct hosts and the nature of the links indicate a coordinated effort to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/mjane36cmehik16roof3k49mje/sulenukibab.pdf In PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23f5e961f---bikar.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/99064937850.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1887ea6e---52459606863.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/7f9d306osqldn6alvsli69vdh0/wowewulaxetud.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/knb00pto690fuacbmacoek821b/50982948031.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4ca24991e060548a4536c39ad01a8ceb/23413604583.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/fe0dc3f0c564eeefb0103beb01be9dd5/16111550991.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/eddd9c3637ec733938ee1ac4a42f2fd7/bilokobasokiwelevuribiba.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/g0soblmoc87dkdoph46ouo26jf/felukikaboravi.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/wowugepemuxovevejigopapa.pdfIn PDF document text
    • http://aurora-c.jp/files/files/jukogiwugut.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b5616f31049---rimutonu.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/34255055413.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210625_5BB3344D287D8E9B.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb04a007c3d---popovuguperewuwem.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79952e5f4---dozodoba.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c41aaed20ab---69583338773.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1fc65058---wazafawosadidajuruwe.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/s71764djtcnfhscodmqhn63u65/fuxajerameteje.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/jewawujalakan.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2c2654ee9cab1a98c960dcfb4f418530/xivigetolirov.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609944ea0e82b---62482666616.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/nalanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=marble+goby+fishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 2184 bytes
SHA-256: 178ab848c5a50646f1d326f2084b5152434cd3e8f1ef6addf02b2fd223383a98
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10536 bytes
SHA-256: ce7c26fb0401d26537b2c148f18fbb1bdecd1629842d6659bbde78e44a31c3e9
font_02_sfnt_off00010b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 18532 bytes
SHA-256: 79f3b5d08438e34e4b0592f76875e9fe57f5aa92184d2e54cbdced43c785bf14
font_03_sfnt_off00013c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00015454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15454 16152 bytes
SHA-256: 195da95b9857c3f4591331ac15912597d6b2172c0ac1881e5315c020038e8fba

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