Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77cabdf412a1e1d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 23:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 509cf7e6049a6fcaef99e0f1879c95ac SHA-1: 0652c07e0c34e387d1283d56cac0e760b2909c8e SHA-256: c77cabdf412a1e1d35f64a31e58806572af91616eb15142e04a9fecbd2bbec57
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other unknown hosts, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document's primary purpose is to host a large number of links on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39c18c77c---taroj.pdf In PDF document text
    • http://shyjjc.com/v15/Upload/file/202192325392028.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109061548026171.pdfIn PDF document text
    • http://allasclub.com/campannas/file/sofiverusimiw.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/97498662621.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/jevofunolipifoferaje.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161420ed2952e8---73704889851.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/85152812531.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/97615918529.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c38e94282---volovororoferuganonokaji.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/5777868050.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/xikifijeju.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/42547259595.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140192179d2b---26246989056.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/77474855942.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ec1162ade8242e9a6b18a220c2132f4f/82004248544.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/gofukebixejoxogop.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/88867343059.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-01/images/files/kigexiwigeninikidudes.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/kudez.pdfIn PDF document text
    • http://llux.vn/uploads/files/27653494339.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/66509216945.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/gusuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=floating+action+button+materialPDF 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_off0000b81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81A 10624 bytes
SHA-256: dfa95831e790d79e6031cabc203991586cd614d913fa44db47a0fc4b5ec03345
font_01_sfnt_off0000d05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05A 14940 bytes
SHA-256: 9ebdd25e58bf901551f7d6317e5864f2cd88e244f3d7f8d03fcab0eed8782f32
font_02_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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