Malicious PDF — malware analysis report

Static analysis result for SHA-256 759944c8eae05a24…

MALICIOUS

PDF

88.5 KB Created: 2021-07-02 20:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 190ffb624d8fe236025ee714719dc83f SHA-1: 39ddcd086448094f320f6324abe8f087f989d7b2 SHA-256: 759944c8eae05a244cfd12fe32183e458fe1deaf5093d5d9842131890db9b78f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the 'link farm' heuristic strongly indicate the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=carrom+pool+mod+apk+latest+version+download PDF link annotation
    • https://catwalkdogcome.com/editor_upload_image/file/51469610181.pdfIn PDF document text
    • http://airsoft1.ro/files/file/77377654995.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b935cfe2d---7188360927.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jopudavobu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf880ca732d---71526575472.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb05449e8e---tepumalumusukogugulet.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/72435067164.pdfIn PDF document text
    • https://diphong.com/uploads/80495839929.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/jekimag.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8f1be2750576fddce26c3a238c401a2e/mevurimomegupaxapuj.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bce8a512---fabolulalomosijozopo.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/20154432770.pdfIn PDF document text
    • http://babamoleskine.com/files/file/88623356634.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5328bee2e---52622762796.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/i0ose56u9u7te3iub8d7f5r576/41216652882.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd6a4d864---89268997328.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pfn91b8ct50bp4pivde8t60p11/55425910810.pdfIn PDF document text
    • https://aitalk.vn/upload/files/25557120893.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/54907808786.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/dugevutamufixubaviwibole.pdfIn PDF document text
    • https://atl-50.com/files/file/78524418898.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/suwelesifivalejuk.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_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 25184 bytes
SHA-256: eb67aeee5bbe8c66191f71aa1bfbb2554f09ac083dbc85e216fe6e068880eb5c
font_01_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 10828 bytes
SHA-256: b9661afa31a8c6917a04f7e216d5496d0a05a7e87b7e23a4258fce77ea50058f
font_02_sfnt_off00013c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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