Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a8a28721768d6c…

MALICIOUS

PDF

87.3 KB Created: 2021-07-05 01:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4de8fe9c886520f9d9cfb32e7e33169a SHA-1: c26c67f9def372a2e0ebbf10d2338e2c2a43c5e5 SHA-256: a3a8a28721768d6ccb23b69913b04848328c8e875f74e84daf27535888972f9e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites. These links are likely intended to lure users into phishing scams or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=4+month+anniversary+quotes PDF link annotation
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d54b7fadfb7ef57475429f48bcadaefd/59343428715.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b83ee6fd8---67011061943.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/40374893622.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed4f1ca8f3---2056724295.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aea244c42---86162143327.pdfIn PDF document text
    • https://bataretak.com/img/files/file/20926191568.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/nuvulosemazadusopaxi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b0e66eacf---vawuzajagazuxomenavo.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c546223644---30374912070.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3a7c0f7dce3279fd25e337203a87e7b6/wasukefojidefuduzonenuwit.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/f6b8411181db6f8df1e847dd82eaa303/71873663722.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949683aa15e---vepagixozizerizanebidiri.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/97771292008.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/6v7bj88th8qvcr5cr3s5i3uu05/57392928259.pdfIn PDF document text
    • http://maxbrio.kr/files/files/96644474243.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/fegefefesafejujoj.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/91764328605.pdfIn PDF document text
    • https://arerp.kr/data/file///96947314534.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f5dda191a---dobofodekumef.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/pojoralarinivowikak.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/spjthujekblmm3tir5qm5dknnj/nofatod.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4764c1aec009aa0b7d5df99a011ac4da/53012864666.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095e37a6d941---fuxividiwatoxowal.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/94d671d9bef7208de1e79e2f0c091dea/babumogofiwebisimaxurutaz.pdfIn PDF document text
    • http://simonide.org/userfiles/file/sodosiwejuv.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_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 10732 bytes
SHA-256: 61b4788c74b7e86c3d6ff30a506511358690a97833189682202d0d3ce1cd96ff
font_01_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 18168 bytes
SHA-256: c3957d8157cfaf72b94bb575af50f94cfdbe9775c9c825cc45b2439d57b51192
font_02_sfnt_off000137f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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