Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1d503699d291cc…

MALICIOUS

PDF

89.4 KB Created: 2021-09-03 19:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2a02832f5d1ecbf01b28e65490d117e7 SHA-1: 04e676eeff58409b4ab8fb649130326d8a199d16 SHA-256: ca1d503699d291ccdea3c27ba800e6e35a5d6d6ac6a794277a1eb67f045f27dc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or distribution point for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=casamento+blindado+2.0+pdf+gratis PDF link annotation
    • https://tomorrowhubs.com/upload/users/files/36844352390.pdfIn PDF document text
    • http://citra.cl/userfiles/file/52961891696.pdfIn PDF document text
    • http://robbes.nl/media/files/rinonuzasaruv.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/kuxunirigizoralomepa.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/78779993188.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/47ab212b4a64333cac90798a7e1e5ca9/5650010756.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c68a3cf5b0---92261494810.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611e4448d3cc9---73727714479.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160721c3fdaa13---10330000013.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/46516923187.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/sijidivafilari.pdfPDF link annotation
    • https://zippy-inc.com/app/webroot/userfiles/files/fijudesamaz.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/306859215.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/bf6bd9ad654d29294075e013c024ab8f/35766286542.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d42581faf---97644129917.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2b0888d9d---xumirijagugopetodurabepu.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/lujixezegakuregosojedu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609092e03831f---96713023513.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/jozilojozewuzu.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210623204801.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/vinazaka.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6aeae7600---16618763366.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609936406a8d7---sepitugeposebinokexiwilo.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/50803469510.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/zugopupesiwaxa.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_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 11320 bytes
SHA-256: 2f13f06e99a204ba2fa0a484a646282fff5372822297c0d5a576c8c236517f9f
font_02_sfnt_off00012699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12699 18756 bytes
SHA-256: 99294fd1a4b480bf4767d048a28d4dbd2356c1603ee98255439e3a321fc9b59d