Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1bfa8214f5b617…

MALICIOUS

PDF

86.3 KB Created: 2021-08-02 07:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43d6144542ebc6f4bf227fe43ab22539 SHA-1: 99581a74d06f80059f6245fd39e1235a8e680b62 SHA-256: 3d1bfa8214f5b6171a029c6a98619bf86e04411c6ceef6abc9f67c1895a04387
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or exploitation. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to redirect users to harmful content.

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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d211564e43f---gufokutipaporexazonaji.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b841334f01c30e445f476f25d7dcf0c4/89672664485.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/bepatojofisavimanezuvewu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a5169b12d---33306750898.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/26226279003.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/7549221211.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/50252735034.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/40273917688.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c43e1490---51946260915.pdfIn PDF document text
    • https://windsbs.biz/files/file/64787805132.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/52222347841.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/529337cfb3eef5d7efcdeaa8a18c5cb1/93614211854.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/fizemo.pdfIn PDF document text
    • https://labelmarket.pl/data/file/nilejimanejapelexuzu.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/90743270374.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/verefagisuk.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc716207c8---peferezamuzotidebinap.pdfIn PDF document text
    • http://svx.su/ffile/file/90686005587.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ace97ddc960---tadanukulak.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/43148295508.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/b23c4fa241b3824b7ba77824bfc8ece1/89461686994.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6ca9258fc---38356809059.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b6d73399116e1d2ac118ae7adbbf87c2/53846714227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=aqa+gcse+geography+paper+2+challenges+in+the+human+environment+answers+2019PDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/23be4e3f7b0931faa55e90feaa76720f/31482076231.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_off0000e657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE657 17504 bytes
SHA-256: 1ced2f0ce8a1c5910a7fb3dd6c407300abecd0cc14c2563073cd840afe4ebe31
font_01_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 11776 bytes
SHA-256: f8c7b17ff172b86a82b37e50c50738459ba0d0a2daf3f455cbbaca7e67ff30e5