Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f639e5e103c4e9…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 23:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0f1c08de9a874d075951465d238d4b0 SHA-1: 18e8da52b061b7ae1702ae7353332c2b8680d3f9 SHA-256: d5f639e5e103c4e965e685869e7d0402420bec615030d62e7e423d19763c0657
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. The presence of a link farm and the use of terms like 'disability tax credit application form' indicate a lure to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://intrigantka.ru/images/userfiles/file/xitonivokalibesode.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed5e3f402e---29416147163.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/vezove.pdfIn PDF document text
    • http://sireny.net/share/files/37530674357.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/51b0a854a3689c7be17d6dae767b08d7/66306386606.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161006b8dbb66b---81024107961.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/reludagekibom.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/90873522434.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/binozidurubipezu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113dc9b2eaa6---fufawadaxajegirudikukipa.pdfIn PDF document text
    • http://888chji.com/userfiles/files/39267056403.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/ravivoraximajipev.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984328779b9---94213077391.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/37787193064.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/bbfd70cc0f31b0e20b3cc52e067770cc/nenazilevide.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/74510864826.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad23dd7af0---zubulomovute.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0beed8b34---bivogofemasigekefi.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/bemudupapere.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/if6j0bb4umnh2egh45lj12kh11/39296680117.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/losulavamobamekeneladib.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/ripixovalafizabuwoju.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/pobubixugamajosutizoxit.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d067990760cdc03ef5a2eb26ad9b7e98/84399567666.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/36aa66e0cef337d6e873b2866ab4507c/pixaxupigaronewoxotutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=disability+tax+credit+application+form+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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 16856 bytes
SHA-256: ef3fd32b30ae7810dc7c4b220a48a4f112d33229a79acbf09aec9057a16f363a
font_01_sfnt_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 11140 bytes
SHA-256: 11d891d41f6fb03b46c0b8a397b5cc2f2f08c4fa8e8447730ba05ba2814626e8
font_02_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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