Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d6ab48d1df5389…

MALICIOUS

PDF

90.2 KB Created: 2021-09-08 04:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 701faeec565e62fc0b37d580755a2e83 SHA-1: 6642b39ccc0f213cb1b69311b40585fddcfa7697 SHA-256: 67d6ab48d1df538976482879fe31b595b4c3ac0124574aa1b780687fcfc2d091
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://learnazia.com/fck/imagesfile/giroforejavixerorubelak.pdf In PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ao0r90rf2fg9j4g5bpo20pl441/15311029981.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb49065786---bafevovit.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/69760603012.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2qtton8qdadj9u464nrg0q1b89/35368931570.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/91894815695.pdfIn PDF document text
    • http://st03.it/userfiles/files/kokalikeriwixizoxu.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/93633979963.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f805b96a7---sozakimaxixivulenura.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/xegofupatozolis.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/wifaxumadowunaguzaso.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b0be031642c136be3ea2d6679bd1d1b9/82188967810.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/dugomaku.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f29f4e8a1f---86030929364.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/kawag.pdfIn PDF document text
    • https://12tiga.com/contents//files/repebifolipaw.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c695743ff1---64535710929.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/95105781493.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c780a467c54---teloturag.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/zises.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/68742457275.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3138939022ee52e1422d156ffce4dec2/moziwazapije.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/diluxegabojos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=natural+approach+in+english+language+teaching+pdfPDF 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_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 10976 bytes
SHA-256: 662027dc69c15b7314fad74d725b1d44e8245162e81f2a8348f09ba6ce050e2b
font_02_sfnt_off00012a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9D 18564 bytes
SHA-256: 05685885df1f7a1805d3f896a27a767e63f82bea2cbc4bc323d33f4c69f7bc09

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