Malicious PDF — malware analysis report

Static analysis result for SHA-256 6477675bc9bd25f7…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 00:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bab5e85087490eb7916ee44b3ef259e5 SHA-1: b1431d52fc77212d5dda051a66a299fe50bf5bc0 SHA-256: 6477675bc9bd25f73a6124ee8abbb5f01919261c93ae9939356f51639b046502
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links further supports its role in a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pensjonatagat.pl/userfiles/file/begasa.pdf In PDF document text
    • https://accounting789.com/ThImg/file/56643217268.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jenukesipabejebasipevujis.pdfIn PDF document text
    • https://deepex.hu/hirek/files/rozetemamafenesoporu.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/54937327217.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131bab5b5154---suzibinomev.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/84378317728.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/54228511749.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/08997af5b2dc81197d58ce452f580d24/zozezabi.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/bivivabigifixe.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef35fc7ed7---jaxuvub.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/69110165966.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/39847811858.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/lepizeninufejisado.pdfIn PDF document text
    • http://debten.net/UserFiles/File/sanukamopiv.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/folunogogitamuvebexu.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/69306753124.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/mejanaxiguxepop.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/44236920278.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/lukanepalexugikadur.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/juziruxu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf71b742e9---87464472765.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/lisabimu.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/vegixipixotejat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+phone+constantly+restartingPDF 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_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 18708 bytes
SHA-256: 52d4297a538801d5570eda5c2d7ce700388bcab54c44585eae70bd05e94a2dd8
font_01_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 10888 bytes
SHA-256: 1cd637b4376edac58635c394479e54f659f381cf4866f20e19607f69ca0f2fac

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