Malicious PDF — malware analysis report

Static analysis result for SHA-256 4659031fb4603590…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 01:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e353d367338e01f67b640b6df3ed28db SHA-1: 4ad32ff74ea9b203e6eb95ea0b0d1c430f7f4354 SHA-256: 4659031fb4603590f4f6208559f564cd859a335811b5ce8fd50939b77e4089b7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://food-cloud.com/home/food-cloud/www/site/site/data/files/rudurakivuxagepikuwetix.pdf In PDF document text
    • http://huefpdf.org/upload/file/54447309553.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/83ab822e1fa0c4cb7199c3d728e11236/91269753864.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/xefaziripapedorufagup.pdfIn PDF document text
    • http://katela.net/userData/board/file/75494022655.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613894b00909d---31924886582.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/8891921661.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/retikafem.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/89695815577.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613991e233531---gadudapafiz.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/78414596269.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nupuvirusinavonotawabomax.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/86149446973.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd2cc0f27---saxalokumowozewimojejarul.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/fogibuwu.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fexobuguz.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/3699963515.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/wozapora.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/nemapikinavinanuvizix.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/zowanoda.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/xibunekemezute.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db29e5d604---kametejat.pdfIn PDF document text
    • https://ikansambel.com/contents/files/zenenuduxubozafudedowizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=amazfit+compatible+appsPDF 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_off0000e5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CF 10620 bytes
SHA-256: 6b1ed62af01ec1bce9b851f6bf3acaf152635d110ee403282b138748ec54755f
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 17508 bytes
SHA-256: 90f4a91940ba592881e61145c4f059e26fbe9920ba142d0f87d3f118a8f9baab
font_02_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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