Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9e47b567da23dd…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 06:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e59cfd5deb46d744ca046fd6b9e60bf SHA-1: edde6c1e5341721aa9de7a4ca6edc10e07ed911c SHA-256: 4c9e47b567da23ddba67c36a74f7c721536eaec9c273b9b43778d657bec82867
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://infrive.ru/uplcv?utm_term=the+scientist+coldplay+meaning PDF link annotation
    • https://aimhc.com/userfiles/file/15289560115.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/43937671293.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/vihnukikpvuar7ptm196vkaibs/tipaxinug.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc96c2129---gufufis.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c50574e88a0de8a7f435b3fd64b0f325/66038910786.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/larikaxa.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/92393518549.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/pikodasizipipox.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/giragokegejizigovokes.pdfIn PDF document text
    • https://angkalaris.com/contents/files/13407470370.pdfIn PDF document text
    • https://clickbox.ro/images/file/suwuxakumuwoxoruwoneb.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/kusosif.pdfIn PDF document text
    • https://tuinvandecruys.be/file/kumuvamixeti.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/pisinanawogozuwopeb.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/litijapeviw.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/28813379513.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/naribugipamoxifufobif.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/cacca73fc31c67e77e3e529dee1c750e/88262277878.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/96773449680.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec98212dbc---95974264177.pdfIn PDF document text
    • http://inercial.es/uploads/files/zibazupinir.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fapaviz.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/31208112327.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/fojuba.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/gubomijexuxotasan.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_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 10940 bytes
SHA-256: f9886df153cc11eac20b28a2c8b1d527adf900510beaccf14aa4e425c92889a9
font_01_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 18156 bytes
SHA-256: f09b68ff14aa396462f29e14ff499159ef99201f237c782fe419a977f3bb73c2
font_02_sfnt_off00013286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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