Malicious PDF — malware analysis report

Static analysis result for SHA-256 168f44607c2d2809…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 21:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1614a1587ef3079cbf5b2218285719e SHA-1: 22e277fab1979fe89e4bd2dc88aacfe7a9aec1ec SHA-256: 168f44607c2d2809f8b209ff14b5c58e51787bd28deb8fe0f47eb4862e359b1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, presenting numerous URLs that lead to potentially compromised websites or disposable domains. The presence of external URI heuristics and link farm indicators strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://laborke.ru/uplcv?utm_term=500+ml+to+gr PDF link annotation
    • https://holocaustresearch.pl/nowy/photo/file/26307238399.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/zarufijawobogebuverufu.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/52980342121.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/dedutoluwobexekexajibaza.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a50eeea55d8---94422867249.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d41175b9d7---25422459020.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/38591785036.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e44a686a23---26335712735.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eaf26278d---tupivebawozutewekodam.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/badugijije.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/gutufunimasalejunoxava.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/wesowig.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d43af659---pepuzo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a29108eae88---23309261220.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/gozorujemisexoj.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/wobavabovul.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507025638784264.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/mnudi3f7jf0hc6aiu573eudc7t/34561179698.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/98525223916.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607187185d4f0---60545714948.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083ddd860d75---55401804073.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021082314192543.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210802/16278910454070.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_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 9952 bytes
SHA-256: 7d6219c0cc0c8fe00792e962f8438d86e0ef1fad9e394a78887b111d4e30c2eb
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 18884 bytes
SHA-256: 8367efeb9fd9d9796fb6da094fed6f25828be46f4c63cdf9e695349508b5c543

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