Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc2298306a68b4d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 11:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89eb20f7d438ec141f4284b51aabee8e SHA-1: 32e75af89c5f1307a9c01a480ab9d64d66128876 SHA-256: 1dc2298306a68b4d138de0edd3e68303fa1a949c9774f495ed2b239c1b6bd791
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, pointing to compromised WordPress uploads and disposable hosting sites, with many URLs containing UTM parameters suggesting tracking or phishing lures. The embedded content is heavily obfuscated and does not provide direct instructions, but the overall structure and URL destinations strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pistant.ru/uplcv?utm_term=birthday+wishes+for+son+on+his+first+birthday PDF link annotation
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/8622154707.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6f7a3c2a7fc769f46f6debe16dc65d13/15127458308.pdfIn PDF document text
    • http://bakoca.hu/files/file/38906552127.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/34597278514.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/91846937319.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/6s2mbo19thu0272hr7lts9tbhe/fejasowurefonufove.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/zodileralulomupiw.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mgtdb2uchl1jcn0884ts1d2g13/vezegujavolunaputuzirale.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/42b000a14d54cd15d2ea3ed4bcbf3444/9716965388.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/41492059295.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/gelepake.pdfIn PDF document text
    • http://goldmustang.com/files/files/tamibivewiripiwatuniduli.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160928bfdcd5ec---zidurex.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/24399373099.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/luloputumexaniwowobi.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/dupavaxakipazixavetek.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bce35119c1e87c5697d35b9ff1d63bcc/88901607878.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/sowesimazavizitadam.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/kewevidefalifox.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160770b35da530---46324243194.pdfIn PDF document text
    • http://groupkaishan.com/d/files/12042730500.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/38cdfef78bb84a703df7866249676b69/44263872151.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/19315130368.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618590eefa---rimimokitisikomumu.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_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 10796 bytes
SHA-256: 36ea1bd067bfa4f555833ca15e22cee8087d87e16285b2a0b7d8bdb6305702ac
font_01_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 16848 bytes
SHA-256: a090bebda5e4400d8560119ca88a7ba7575b7b1813b425738a0ef98e89d5c8ec
font_02_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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