Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e8e4f1d037dc75…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 00:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 637e7b596c260c5280719aabc0eb96ae SHA-1: bd0f77d9932917a94e8297d8e20baefd6ecb0db7 SHA-256: 19e8e4f1d037dc75fb28ac83e43f55b6da35c8d5ec4fba0d2f30fe568d592949
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links that point to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the links strongly suggest an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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=beautiful+wallpapers+for+mobile+phone PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda8d0db5c---94130417855.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/sikavewoxenapurerax.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/segamakilaliduwix.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/71942575358.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210910_C4091BD17B5AAD0C.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/gipulujogubasilumor.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/31832155209.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/winogenaxebogegajame.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff58eaf73---bebalolesuvijo.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/21994808243.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/59614607972.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pagekokunuvoleli.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/velosebilenesabamib.pdfIn PDF document text
    • https://asi-filter.pl/files/file/23066485656.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/kupivegesusaxogovekibipoz.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/pulozu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/rpgk111ilnc8jg5foode96gojo/patesoposugamokajir.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/93369978006.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/karatusotudetu.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/14502515422.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/zikefizajirobakuvu.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/palesetijujukarozogabali.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a83661ac8a---zuwatofagamufogedakilisom.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/mufukisabanujidivena.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091816134940.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/zesogivaruda.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_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 17700 bytes
SHA-256: 3b5eb7ef1a1b29378d6f45f0cc39a0b427a20e962730138320423b3f0a7865bb
font_02_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 11000 bytes
SHA-256: 8aa46e46a8b1eca4c4ab366bd8215b16c791206c32dce96235141c8b7df47cf3

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