Malicious PDF — malware analysis report

Static analysis result for SHA-256 30926c56ae590ac6…

MALICIOUS

PDF

84.2 KB Created: 2021-09-22 22:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca63aa3bf2e321da26013bb96df816bc SHA-1: 725cecdfa3ba236e5eb516003600f6df864b53b5 SHA-256: 30926c56ae590ac692b1a4647282e95626ccf804ce92dc0dce5ed8be433e6332
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The primary attack pattern involves luring users through a seemingly innocuous document to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ae2e748d38b50c0efc328fcc77ae33c3/tijidadovewigaxotaxo.pdf In PDF document text
    • https://rijst.nu/userfiles/file/noruxikanitukege.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6e70891af9deee9e8fefb8ae6a3fed62/sejomedi.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/kawanef.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a72118257---wipesumuwo.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb50579204---75366939877.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/wuvapep.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/75345642959.pdfIn PDF document text
    • http://zzquansu.cn/d/files/ruvolawize.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/maxasiperux.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/60641906715.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/55380030380.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/47723417923.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/31m070l01hdb8jog71lha18sfj/fonopejuzerufetirokakivit.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/9896916547.pdfIn PDF document text
    • http://sial.pl/galeria/file/nisadekujaluki.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/12291861164.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/powogovoxevupupoxul.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/sirinaxapibofonivagodeb.pdfIn PDF document text
    • https://citronel.com/userfiles/files/37569822800.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/16434823675.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/butimunidiwepimuze.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad78e6dc1b---67126050318.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/gogarotevevufifuxiliwulug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pdf+to+excel+toolPDF 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_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 9944 bytes
SHA-256: f5f9b7aa05a159480c10428edc70d95070384f04eb0e8df3adbc0ea75e45215f
font_02_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 18300 bytes
SHA-256: b00db20edb7fb2202972f69ed6e48fb54e74e29d3ae3771eabc49e3c26e69d85

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