Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23f2d2c32759cf1…

MALICIOUS

PDF

85.4 KB Created: 2021-10-08 06:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0bc53b95895c98d3ec8b2d145492a18 SHA-1: d10afeb92ff673281286b79ecb45cf1c77370e6c SHA-256: c23f2d2c32759cf1011611151d9949927a546910d9bf92d468b609ada0f811e4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm, including links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific attack vectors beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://aptekarynek.pl/zdjecia/fck/file/lituxit.pdf In PDF document text
    • https://laplacedesstores.com/upload/file/82928140439.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/zogizidigitasovinevef.pdfIn PDF document text
    • https://red-adlay.com/upload/files/bodulegunonol.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/soxuxaxoxejuvazijeko.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/9374288104.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/fofaxinenibozavu.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/mekaduginobo.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/metuzokozatu.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/lozuzelelikonodin.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/57379814964.pdfIn PDF document text
    • http://fitviewer.de/files/file/46024508021.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/72301762370.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/liruwekekonitasefuneseb.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/vemujipolizu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/3e88a34ceb2138938b80b05222927465/8934189571.pdfIn PDF document text
    • http://hexindechem.com/upload/files/febagexepomusejopotetifen.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/52597483362.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/lonupalor.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5d7e72215755ed0143f8c673443eff8d/rezawixaxusumine.pdfIn PDF document text
    • https://tele-video.ru/upload/files/ludojibawulupe.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/xakerutonodefujamenitono.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee1f585bd---18696118725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=immunized+meaning+in+bengaliPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_01_sfnt_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 10356 bytes
SHA-256: 5fe9288d0d4a9dff8e70b11e02aae4e1c4d2aa5c8c43ab05708b44b54e2406c5
font_02_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 21292 bytes
SHA-256: 1d5a7873c5b1199d8b143c65bdfbf21864eb3a02fb2a0ac9f1fc73ca498a5dbe
font_03_sfnt_off00012f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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