Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad6810f5870014b…

MALICIOUS

PDF

75.3 KB Created: 2021-06-28 00:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fb2d095effd9a91d9c31ff99ea836f3c SHA-1: c68e07756923c7eacc9bde41ff9673915b8cb04a SHA-256: dad6810f5870014bc4534fbbdfe28eb0eab97d67946088d9441b971d885ff2c8
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. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=the+hacking+of+the+american+mind+free+pdf PDF link annotation
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/77538079100.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/1fca1edb1204f3ceeddc68d78c23a001/zajenogiwewexemudegoga.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f53abe42---xixisamajosegapemepakofin.pdfIn PDF document text
    • http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/912vji2bn9h8qtc23kdlp8148a/4392629633.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7c39c532---73352046605.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/684b9feb30eea17d19c0c9abae4a7607/ribulopudirabiv.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/12733696548.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/lugaxiz.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c41f157fe30---juxonagebixuwif.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53c539cd74---nixobelefegufomimokixazak.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/42582462061.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/lajumilirukuzafiwujijak.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4g8cms1mdbbe4d0fiqk4mtpncc/65888374098.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1b2544d1d---54310219615.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2711da84a---24559062867.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/82654987ddca9f06763887c359eb864d/tokadowoxunomakader.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6760ee0dc6---26994019610.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/lujolaxobexoniveviludezur.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a86d4d20792---fubixufog.pdfIn PDF document text
    • https://argumentua.com/i/file/57809371425.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/44802649082.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071799ed0d61---56739312210.pdfIn PDF document text
    • https://haidangpc.com/contents/files/47028757380.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_off0000c3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B1 15864 bytes
SHA-256: 8233c201cbd7b732c520c432b6abfd39c8d9197cad6c3ec64a01b9a41636429c
font_01_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 10908 bytes
SHA-256: 3e324631806abaf36a7b5c38483251ed85859a8eaa644b4bb710d9b1bab08330
font_02_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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