Malicious PDF — malware analysis report

Static analysis result for SHA-256 d313156b76411502…

MALICIOUS

PDF

121.3 KB Created: 2021-07-31 01:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: c5040c4416b78eb29241d5b1a6bf9f01 SHA-1: 9556ca94ea0e330f38973c850ca961fde57d7b49 SHA-256: d313156b76411502f55a1bd7cd295cc32c5027c55e3b9df3fefff74ce23af6da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://euro-ex.com/images/blog//file/5003955648.pdf In PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/66ff8ec1f6da5e8a94544d9e93bdc829/11909774472.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050449564299.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/kukinuwanudovudoxuxa.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/19/jakizoxijipogufurudaron.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/zafejomutuxewofov.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/42309184322.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/n2ft1cihb6d83e27tp6j0f4ecp/55305499329.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/rujazovojatugimagubim.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/musatatirunelokes.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/70873070646.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097e365229a7---luluwewifabipiwafu.pdfIn PDF document text
    • http://szpk.hu/_user/file/niwilagekoniropuf.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d550a266824efcb2c501ac4403d34051/jonugonifirudatafiwosesev.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/34668880099.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/70364000731.pdfIn PDF document text
    • http://hitoduma-d.com/files/files/88543785622.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/fawesamox.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/74891531060e0ec1e37b3d.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d6a57f5d1---17916358072.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c256944137d4691d768bd99a04ab14da/79849106148.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/lopipobusukeku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928c8a2db29---gutekizureremixodavevapof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=holmes+on+homes+lien+on+me+lawsuit+outcomePDF 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_off00017410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17410 10572 bytes
SHA-256: be8c85f6698be88eea14368c2c51691350121d7bdb0a11a7575c131e61fcf00b
font_01_sfnt_off00018c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C05 18404 bytes
SHA-256: f0923b90da38233c501da6721c115b61133a9877e2cd9ea50927904bcecf386a
font_02_sfnt_off0001bcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1