Malicious PDF — malware analysis report

Static analysis result for SHA-256 234f346479f7cafa…

MALICIOUS

PDF

96.7 KB Created: 2021-07-27 21:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 194f1669a25dd8a6c400c4bce5c699a0 SHA-1: c68ae817d697256789045666549456704fc87697 SHA-256: 234f346479f7cafa0f0b8bc54a641cdb3fdfc8c91b2085cbfbd9fa960d3f69f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://alpha-th.com/userfiles/file/xovifonoromosizum.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/90b0693653fd4ccb5b61f5e705418fb2/83249091913.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1d257e6e---nesafuz.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/9b8946712739dfc2d08c370dfd6a6342/vakilekujozaxixubixifo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/9dc1c6ae2a1272960b80ea68d3b2c56f/84450018253.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/48192640759.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/92e067287125810cc0febad1ad98da36/41759817582.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/zunanoweja.pdfIn PDF document text
    • https://schmitz.cz/res/file/66002346599.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/56668513885.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/xugibidutimudesobulewafeg.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2087eeee4c159358745a927467015594/dikusubojararegibotuxagip.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/sidovowivizix.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/81086635293.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/25317171448.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/6470529368.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091bb940b7cc---dosimusixaporusukozuwelu.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/74072247108.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88ba8cd040---kasirazemaxijabel.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f846ea1bbd---zukukazozerikazewim.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/37841166055.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/iku6he48u7rqadvthubdh3lhp2/11897565738.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dufovewa.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/4727479327.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0b0a2a70a---xelos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=disney+magic+kingdom+mod+apk+latest+version+downloadPDF link annotation
    • 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_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 17720 bytes
SHA-256: 9e62dbdeeb45f99988a9685fbdd592ba2f96b7255e50524728f34f2ba609059e
font_01_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 16356 bytes
SHA-256: 10461ea8115c76e62dab626a02224ee84f2fabc0c634848a49c0e76d8f27a0fc
font_02_sfnt_off0001412c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15943 11216 bytes
SHA-256: 7fee6bdf8de66d9e496aea1981f9242cde26728e601d198ff4290b85184abc56

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