Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8ce657a5b3b21c…

MALICIOUS

PDF

88.5 KB Created: 2021-06-25 23:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 661bc065d8f6885d23a244707e103b73 SHA-1: 8ac25e68cae9920cf716602cb454fce072d4037c SHA-256: 3b8ce657a5b3b21c07e257c3bd9ef193630a1e7c089ab3630d6b101b6108173d
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://royalgoodviewresort.com/Uploads/file/ketowijewi.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ceac6eb51---vapidumijotusab.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e39af89129372f2f9f25c652d87c4f7f/54904239379.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ob7sc9rdvr64b6l548806q4q22/faxukajituruded.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210624045716_l7l7p4.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4bjqg3uj5e5fc1tprn6ml2cnl1/93509122882.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/37739383657.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/be0f88f3d1ca77f180b6f7d903f0cc13/dasivige.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/4087258720.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/57445779775.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160906505db395---vagubepubenixulevu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987679ebdb4---zuboxemimikilumemarifoto.pdfIn PDF document text
    • https://dineflon.com//files/wabiwukuwekogofenurizaxil.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/350a9b0cf23637cc2aa28a4ddc4e2a8e/46833924857.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/98154ca267ccb236bd312f1c7463ed30/luvapo.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210614_ED7129DEC0F6AB91.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/364169c97d1bee76939a313cc566e13c/43942068493.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4e9b7f2123ac2bf42e14f78a1a2481bb/34472440363.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0b43e5a85---gofubuwasa.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/n8rjvg36a11256nc3midd5qeq1/52450236739.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/addd9febb9a7fb6fd3767abb61437464/fadosadizijekizezavatosu.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xakofi.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/vunadajigenonenuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=excessive+drooling+in+newbornPDF 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_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 10660 bytes
SHA-256: aa818066262f4b6a50ba22dafc6a8aa7dab98dd201211b5479ece072abfa942c
font_01_sfnt_off0001107b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001288d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288D 16972 bytes
SHA-256: 069fe4917dfe3d0ec83bda7ca53ea416d35d0242d66be71d7f6e5e6f1d4fad41

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