Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0b9fbd93ce0aae…

MALICIOUS

PDF

75.1 KB Created: 2021-08-10 18:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da618e40a43038c476b4c16f71edc677 SHA-1: f60a61737fc65cb7d02d61ba8de235444dcf9062 SHA-256: bb0b9fbd93ce0aaea713ff6feb653501d9fc2c7c71701db3101f90f94dee5ab2
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to these external resources, potentially exploiting vulnerabilities or tricking them into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://smidgel.ru/uplcv?utm_term=symbiotic+relationship+worksheet+good+buddies+answers PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/gumibosu.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d3b90261e5589fa015b480a0089ce84d/nigumetarivasovu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1281f4fbdb---tivamiruxuvoper.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/65f01874ff87688001d1e03944f06ba8/26304042567.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085861abccf1---muritixeledudojozakomarop.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/dudutawapi.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/vadope.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/42924924837.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1fb7be0e---27425117448.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d356f5666842c9c2d73beae4e7a106a0/gonaxosudewivag.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/164id21aop4u3a16htibcgks7u/22627416398.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84b6baea4---85204415958.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9e2c1e6a1ce3259aab224e3662134d71/98547456144.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8712c48d8008bed5c0aa79a378f70dcf/73538645068.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/94890485935.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/50571046251.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/02ecac31dd6b1fa109829d96f5e0c392/suvegalegadumi.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/1676131096.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zivuzegawaveminolu.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/jt9pdd8ff90rijrbsojq3gfaod/nukolowabavi.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97567282796.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/56546922200.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109620564e71---tagedewelawatika.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_off0000c1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A2 15420 bytes
SHA-256: 0d837da96ac2bee7d71cc35bbb44c4e62c008ea5d78643407e29c8a468b1b070
font_01_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 11568 bytes
SHA-256: 7f25a839a607450bcde3a1a7f039270820b1bda23ad3e3e596a6004c4416afeb

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