Malicious PDF — malware analysis report

Static analysis result for SHA-256 3526d441a9208797…

MALICIOUS

PDF

87.5 KB Created: 2021-08-17 19:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71213cb73f8874e66058322502a5a9c6 SHA-1: a8e81a6cd33a63a83569977da80ba411b2e4bb3d SHA-256: 3526d441a92087974ed02124cfe87bc739eb973d186c55c1018e10d335a24ffd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=where+to+put+powder+detergent+in+beko+washing+machine PDF link annotation
    • http://alarcon-v.com/editor_upload_image/file/4717932526.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/32011233159.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/97448419274.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/11734695714.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/30443688157.pdfIn PDF document text
    • http://malifer.hu/upload/file/45420867051.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/1875422223.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210531_115505.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161068a162ecfc---mesaz.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a6051ade570---87640133480.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jjrb00p34suf9tsvdbslr7c0j0/11233522837.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/11378151834.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/44860379407.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de26acd9b9a---21725878338.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/27876225935.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/66041701670.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c39ea6443---98762801631.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/73122883088.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/gorodobafinira.pdfIn PDF document text
    • http://camwater.org/media/files/wakilefipukisepuluregu.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/talimulezikixutaman.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/gewolexok.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7fjd0r3g98a6fam6u3k916bot8/seroruvadidip.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/78939841384.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_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 11324 bytes
SHA-256: 968582e2df3707d939b7e056fac3a61fda2a975983762099e95944f04ee170f5
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 16552 bytes
SHA-256: ed79a46c0a3b41dbccb93c346742760595931002d8de3bddf2d168af9b6b1af6

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