Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad1d1619869963a…

MALICIOUS

PDF

103.0 KB Created: 2021-09-21 22:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 13a377ab6e740b899143f195b2b1ed97 SHA-1: 1d3cf2994484da6ced5b04246abeb8a0cdb96932 SHA-256: 5ad1d1619869963a2c874d543dcc31e454c3a6930a2de479ee87c906abf6551a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially being used to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://smidgel.ru/uplcv?utm_term=gta+san+andreas+money+code PDF link annotation
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/12953862852.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/dopanefolaru.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/51747196304.pdfIn PDF document text
    • http://ecole.ru/text/images/file/59688111876.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/94247123168.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/gubelezuwipiforiwig.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/foset.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/49858525119.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458ef6dff7f---dawitowuxibade.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e1403c93---zuxodamiwatuperowari.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/93824197695.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/89520812718.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/tigojonodawiko.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/muwoku.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/74288402008.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/vozemiter.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134290564dcf---sorotiduzelekaxuzemop.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/93669989246.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/50811837133.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/82789060244.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/bototonuxobotovuba.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/77961599780.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210907200856.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/6855304309.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///54592567234.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/11841288105.pdfIn PDF document text
    • 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_off00012ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DB 10548 bytes
SHA-256: 52ee3545cbf91a82216057771a121e0576cbe9be2b5eb7a38509fd8aff3cc669
font_02_sfnt_off00015ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF4 18160 bytes
SHA-256: 057389c9cafd25c7672eda044df37ab670803a1c8c096c40f947e39bb2f4f89e

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