Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3738cbd92072bf…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 02:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 987bab06bcb5385cdc4d4372f5c9d65a SHA-1: e471401674553256390f372bdc2a75b77488ad08 SHA-256: 6d3738cbd92072bff8441eb401a73751369b2527bccff22f11125310a78967f1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a2362642cbd6917e3dd3c79af1f35415/20589419061.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///vitituxenuvabededekudu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e512d41f17---zevotasudexulasaget.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/febeviwuwekerolumanazoru.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0d68656185835d250d79cb9f7761a81d/gomosibitunorajumanodum.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/vewaferetebevepasozon.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/voberepuvuseg.pdfIn PDF document text
    • http://boki.hu/editor_up/fufujebatunokafoj.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/vorotor.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/70693651131.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/palub.pdfIn PDF document text
    • http://sksound.com/userfiles/file/wodulejerisudaga.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3833c4e36---65091963032.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/tigivekamur.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/pewivuzijesorutabutokamu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4a972961---mifogusok.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/83019482394.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/6463215641.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/40247164794.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/bimerux.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/80623978562.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0bf59b14c6923074e45c7706f8c25f4e/13942440615.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/tobuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+scan+qr+code+iphonePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 10692 bytes
SHA-256: 4240b76749ae0bdeb3a3094a98fce1b38d6d9cdf7bf50666c93daf3d0a9eb0f6
font_01_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 18064 bytes
SHA-256: c585ef778d4280bdb3bed78b13c984207372dcd52a2dd301d35a20a73decad43
font_02_sfnt_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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