Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6ac088a73bb784…

MALICIOUS

PDF

115.1 KB Created: 2021-06-29 12:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ec5e496e5c78d8827e48650de1dd7d39 SHA-1: f8dda3ccbca42781ea67fba1d975fc3612810bbe SHA-256: ca6ac088a73bb78456cac79cedc920fe905cf8d8bc0cd4d1c9994ea585eef102
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users into visiting potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d5c1ca5ed8c722adbcda05db85da89c9/16887531383.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a286d1550f2---26537934756.pdfIn PDF document text
    • https://clinicscrm.com/img/files/vomuvebejiwimad.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/88885804182.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/44bf7ffd879a2dcaa8a42904868d5260/22781112695.pdfIn PDF document text
    • http://capital96.com/userfiles/file/ledivupewowepufet.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/zinivebikivunokemolaxujov.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/v725hfoblea9v2rmsgdb7v9aua/43918032075.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/petexum.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/44412028375.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mavasigisokikanosokizezu.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816ea4502c---posevopuvonovekudebiz.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/33bd5f6849693be89564f1845b96bede/rutavemipu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e82127fa28276c6ec4c8f6b1c67e4801/migesugafenuzuwudo.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/mukajuki.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608761a5aafef---48931588410.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a5f5ca81---wuxijeb.pdfIn PDF document text
    • https://isleo.com/i_photos/file/9190800407.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/v0ikftks05p12cjc3nnpk90enr/64487075314.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/lonokavevirevojijivuji.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/nojusisilukotitekowe.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/66062454913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hermione+granger+and+the+goblet+of+firePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/vadilixudutudibawujaz.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3D 10764 bytes
SHA-256: d40b87d7b64eba8109bb47d15bb7f2ec8704b6483b91b542872a7435af14189f
font_01_sfnt_off00017779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17779 18076 bytes
SHA-256: c06e93c79b6aa82ab40cbfe715a74e3b022ec1637a3b696bc00960f266449a39
font_02_sfnt_off0001a6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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