Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d7b7e75d87474e…

MALICIOUS

PDF

89.7 KB Created: 2021-07-24 00:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb9a35a749277538b5883d7224c102f2 SHA-1: f7d35f7fd70476b5395e736033e4dea381b19e31 SHA-256: f3d7b7e75d87474e7a188f659b20df7b158bdeb902238ae6204e7d5e7e5cbdfb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. It contains a link farm pointing to numerous external PDFs hosted on compromised CMS uploads and disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/95e4285592f96c7f8fe2fca11676e484/moxuwemarobikato.pdf In PDF document text
    • http://suankaew.net/upload/userfile/files/77135314961.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609b588a18edd---95749502802.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16080c4be4c4a0---26664643313.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/52239686835.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/13794393400.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/15551380123.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/478c7b939d1275326e90c48138956484/94406922043.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/nekotevijexokaminudop.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/55056365958.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089b9c2f1a7e---56859465283.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/47883312297.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/9485959004.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a67e02b2169---19785159688.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c575a315325---gaxezesi.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/gusojemus.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/981efc419af2cd1abef9adb69d6de555/rikunenibigaji.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6be4b9b68---44344254191.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/22645382654.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609644dbe099f---ruzojujarujebufig.pdfIn PDF document text
    • http://willbramephotography.com/gegutelolel.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/82545963559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=2020+porsche+cayenne+manual+transmissionPDF 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_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 10996 bytes
SHA-256: 27d5a7153067681ffb7c92b2fbba25b34e2f190a0c7013b058e8cd01eebdc4da
font_02_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 18176 bytes
SHA-256: 413e2e11c35c95a5cf9cd78c5857e017b079cca94936cbc228237dca37855d6c

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