Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74bc15261a0aa61…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 14:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5dfbddef44faf4acd16ee6debfefb8f4 SHA-1: b1fbcbb8a7c99ee8806987f35271c9f1e67f8f87 SHA-256: a74bc15261a0aa61b64bb2c6eea5fbf4fb1aa88dbb769adce228874dc2e63a54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO poisoning, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links pointing to malicious content hosted on compromised websites. ClamAV detection further supports its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=internet+explorer+7+free+download+for+android PDF link annotation
    • http://conservativista.com/js/ckfinder/userfiles/files/vufabure.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/k35hpa2jo46qi659hg8qs3nh1g/37420494732.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d82825706---43776709479.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/fajetiradixixogudep.pdfIn PDF document text
    • http://wohingltd.com/userfiles/vusini.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27142046899.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/fobuvaretidipekisabe.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021913023591661.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210913121414_1281919968.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/pemutuvivirus.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/3516565696.pdfIn PDF document text
    • http://greenbrier101.com/userimages/muvufifuzogifulelisutija.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/7781589665.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/wufositimasulitafap.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/19086986536.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613b54f5ebab8---89075714938.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/jamapoditijem.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/88399992006.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/40511151861.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/91627572066.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-9/20210909112657900185.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/61042835028.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/wuradatul.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/56281912655.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 21676 bytes
SHA-256: bca6f5b462da184b5d24a6e976737fbfe768f4fff8c67e5afdd5e5c9639efc35
font_02_sfnt_off00011de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 1732 bytes
SHA-256: cc9aa9d10d6f336345dda96c648cf1cebe6fdaa1cf59576acfec5bb48f04b3bd
font_03_sfnt_off00012619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12619 10512 bytes
SHA-256: b08c21201be4dd4b72217a75751231142ebbacd47966ffb86303e5e889290938

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