Malicious PDF — malware analysis report

Static analysis result for SHA-256 732c146a5aba7ca2…

MALICIOUS

PDF

136.5 KB Created: 2021-09-02 18:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a714b016bd7fefefc0d56ed4bbbd6e6c SHA-1: a74fc808d8459746289101abe153b27d6b111a7a SHA-256: 732c146a5aba7ca2253c7eb589d8c491d16c16d49135f1f234501b1a6afc5334
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to files hosted on websites that appear to be compromised or used for link farming. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to distribute other files. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 5

  • 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://bsinteriordesigner.com/userfiles/files/47789737702.pdf In PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a484f02b7---wogopapabazipozabokagun.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/sumezibenaterejaviluzi.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/69908866611.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5236b497---12881110087.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ade94e74c---dujedazamugelu.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/vepepuzibosikovawitogub.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ae32b2ef74e---31851916416.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2475aae57b---zatumafumukolonivi.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/8k50t24cgjio8tmo5psp77ceu7/60836252030.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/32665757905.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/88bb8a946cb1dda7fdc18cc8c66449f9/86838392549.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/sidibobigikilutep.pdfIn PDF document text
    • http://kesifveotesi.com/files/wosalejuke.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/wugofijufitapaserimil.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075615326c37---6034640764.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/desukexogenixarolivibar.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7f20c449a---javamatelofute.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/6148884123.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e35e72c32770d1af6e42776db8da0835/88558850073.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/xevizovajusoxule.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/saxabuvokuv.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085a53f8ed6f---51957204036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=paracelso+libri+pdfPDF 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_off0001aca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACA7 10552 bytes
SHA-256: 14069663d25e8f68769eb817323af1c5886e1a96e620c6db0e883e37f3b219c5
font_01_sfnt_off0001c487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C487 20676 bytes
SHA-256: 20edfb950cb6f45710bf107009b5599059ce04e855ad0f773f19b56fbc995e74
font_02_sfnt_off0001fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1