Malicious PDF — malware analysis report

Static analysis result for SHA-256 629e9e2646fe03ce…

MALICIOUS

PDF

92.9 KB Created: 2021-09-06 12:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2853e07a755354ea3a607d727f327756 SHA-1: 7fb8c3d63367e5342999901ffb8b1ecb942c6d50 SHA-256: 629e9e2646fe03ceb78f5793eefcb6757fa1cf4d150b5d0a4ef2241611650e28
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of embedded URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://chcial.ru/uplcv?utm_term=fungsi+sistem+steering+manual PDF link annotation
    • http://cnhhgj.com/upfiles/userfiles/file/nuwilogedemela.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/587c147a311d406b8e313cf0066209c5/sumegosilodeluro.pdfIn PDF document text
    • https://eklyps.net/images/file/51482197118.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/pefogudoresevizozoji.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/xogararagil.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160fd402ee48a2---1690478342.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/36503855721.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/gudekosijifevusu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0eb148a143b5908be422c5618ba2a109/bugerebubedafarutibijira.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160fe497f88992---49378053114.pdfPDF link annotation
    • https://ludifrance.fr/userfiles/file/vasubajenedu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b98afe303d8---bisam.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2898a32bf---37232096917.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/45084c39de3786bbb5347b351d5b7c49/48558910812.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870e3c9f6da---towirowewulupumetizov.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/29501968115.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081894b4c585---pozolid.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/60377892553.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083572db7ddd---12021979258.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dcde217728---37408967164.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/53426728835.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/fawotugimujemitaz.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/tedamu.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/39947248678.pdfIn PDF document text
    • http://www.moyekolodin.com/files/jugud.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160976c4caab0c---74739883876.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_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 10408 bytes
SHA-256: c2ee860a9ecc3387bfc5c5d6c70120a54e70f61ff4c24805c6ea5c7bbdfb01b7
font_02_sfnt_off000138e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E3 17820 bytes
SHA-256: a0052543996cfc65443b8b90fd246aa50e791a50a20106ecd81b237803b12493

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