Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c5b55de2a5bd42…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 19:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a59bc7600a6ee0717b78b084f5efebb8 SHA-1: 0e9b59291f1838fab898d9ec81663c538682e853 SHA-256: 28c5b55de2a5bd42a4db55240dba410c3d2c0241fb2a3b461e6d11c0b8afa661
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains a link farm pointing to compromised CMS uploads and disposable hosting, designed to redirect users to potentially harmful content. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archifolder.com/userfiles/files/90577384544.pdf In PDF document text
    • http://master-vin.ru/files/file/28606792455.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c07a86d066e---2191772058.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/dawozu.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/79912405686.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086c891dd0b1---ladovepibuwigaret.pdfIn PDF document text
    • http://checopharma.com/upload/files/69871750955.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c3078ddfc9694b61624a5d30d6fff15c/68154657180.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160739e362b956---ropulesogefupukibo.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-4/20210504202447435820.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/bugajerijesuruveverafum.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/vijepekakufudobew.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/kepazesagilojawiwudijuba.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/dasisiwowavutimo.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/37900560444.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/zuvejudepelowadetigavovin.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/51600808649.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/45003590485.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/zivapekubinodimapaluzofi.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607251ba12740---23456640290.pdfIn PDF document text
    • https://lecachet.fr/docs/files/siwebodejirakilemile.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070e128ec49c---ninepafuforupi.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/pisalivawoju.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f7fd8515f---72776964423.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/10684956459.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/69036068484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+edit+pdf+on+ipad+pro+with+pencilPDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 10624 bytes
SHA-256: 08133e7445a4f4b036c92bc517c552c4ed45c8ad23d483136a507d4fef4750e5
font_01_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 16776 bytes
SHA-256: 542e0af59e2d5306186f3633a24733fa5ca11f61946c51bd7861642c94a35885
font_02_sfnt_off00011e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.