Malicious PDF — malware analysis report

Static analysis result for SHA-256 858ada7d084613ee…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 00:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 122dbc10ea5d0e48a04a2d61c8ff047f SHA-1: 07dba5b8c37eb43b9b1ce604df51a534aa898377 SHA-256: 858ada7d084613ee795c0d576eca363f9a73fe189bb46c25f7a62f86c86da3a3
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on compromised websites, suggesting an attempt to lure users to malicious content or exploit SEO vulnerabilities. The presence of multiple external URIs and the compromised CMS upload links indicate a distribution mechanism for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cafepiolho.com/uploads/assets/zapolasewaguroxi.pdf In PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/wisiruwojovutub.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c44cede54---3630844816.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/wevotojavudekima.pdfIn PDF document text
    • https://razredna-nastava.net/files/55970147015.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c194ba34490---dejudoba.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/rorexakekiduzevuveba.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7f85c79b01a3d21a41e1f8190a321cbf/xipodebovagajerorajazaga.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/143e44e38666334b2d47b004e80831ba/dojob.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/38096448545.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0458c3f734c0384186ad83a559e60ae1/pukoxupudararevaf.pdfIn PDF document text
    • http://hydrem.ru/images/file/91532261420.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de6a86788---xikoven.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/tezavojudatifek.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/maxuvoji.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ulln0tocj35srhjjlo8h6o7ism/vuxekenenifoboleme.pdfIn PDF document text
    • https://go2germany.ru/files/file/wumetedisalaranekit.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/xuvuwezabi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/418eac4dda9fc034d9b002d3af935a6a/31174149278.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161242e80199d1---nelefunetama.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50ba0163c4---kibekowolito.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/novutifabekeruniwapan.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/50942244356dfef36ed739890dd42730/dowulive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=nmr+basic+principles+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 17988 bytes
SHA-256: 2614faa34a9c050251f5e3bd111290e1e0d82114a39bc9927dde0b492196e87c
font_01_sfnt_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 10680 bytes
SHA-256: 89497d2d98d9fa8b73a9ed1e2c622705d7ec801fb56134b3a979e9bac3857658
font_02_sfnt_off00011c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.