Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb468d1633c6f97…

MALICIOUS

PDF

83.1 KB Created: 2021-07-16 18:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f688cf434f58108db07412f22525880 SHA-1: 6ff7c4519396cd920e7c35ab73c81a6c8ea73073 SHA-256: dcb468d1633c6f974e3794704757c2cf70730839fcfae91b96ec5d6313e4da5d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to WordPress installations, suggesting a link farm designed to redirect users to potentially compromised content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9950819824---64986508035.pdf In PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/080f0380444735d0b8e091b237f60988/sesopisojuferaxusud.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/nufebazoxa.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/1781595520.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2d643d9cd2a3f17704c6b6a37fa6df09/3293533215.pdfIn PDF document text
    • http://retailcop.ca/files/33961118542.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/2970539460.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/32259127514.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/1b843007bc074ae8e1ad35fbfc3e28bb/xilonobezokesomuke.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jidotelumu.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/wugalusoranalakos.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/60772932519.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa86d7b0e2e---53392942252.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/88445097694.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6983c55f7---83693387217.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e879c3e05b62ae6511ca37aac6b5af2f/kebovudidedavujofobab.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ae61391b7f6a9024309b1893e4df2d3e/xujizivu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd14ea449d---jijedosabagimos.pdfPDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e78949519---digumufitijadozuwonen.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/vamogajekuxedilunudolulov.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/kovadimuzivusedas.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/nu45rec1h1ferdhjo6irla8r81/guwibopado.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e819f16e94f---rixusen.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/2gjq6su5n6jqje8jcbfhk5gdph/10299524359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=yellow+types+of+colorPDF 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_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 16868 bytes
SHA-256: e0891280638a34da5a92ebb6453914e690720dc5721e108a2b45c56ad2189465
font_01_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 10300 bytes
SHA-256: 1933b2647ac596beedec483ad9a43799df347d5e76b804c193ef694b841c9cf4