Malicious PDF — malware analysis report

Static analysis result for SHA-256 b493079573378cc4…

MALICIOUS

PDF

95.3 KB Created: 2021-06-28 14:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 727a46a008cc7560994c0e4659b32bad SHA-1: 00bfd69ac436cfa77fdf4b5b90df9a763f93806a SHA-256: b493079573378cc4f655f6282ccbea2d82d38164607af1e7da919cd7b2701fee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d100e7b80e---nufotovowurunovenek.pdf In PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2ddc59cc---fawesigigevelejapepex.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070689eaf81b---lorolonuwesiremufepida.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/8618621128.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/gv5rttlr04b4rlants6qhuc695/87956753190.pdfIn PDF document text
    • http://canadanur.com/resimler/files/dirofodawamutekamagaramu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f41cc523561b71b9e8c3bbf978365a46/27049913377.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a02928df4b9---vipil.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0031fc2b79---31603378248.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/nawubigalikuxagonuva.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/ee442ec5e733d3c1c42e1b94a6b13f5b.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1752c5878---67726251831.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b276fbe9fb5---72176757777.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/h0b671dk0agt3hnq2i85jbitp1/82037326156.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6qdbvncgu3lq124465hju6a823/tolaxuler.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52b889b5c9---juvodatixelobodoxa.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607463cc5d3de---38999649130.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/82189664708.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6akpj9hv17o3u4c809ff4f5jar/fapepiferevas.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/waxibajozunabanu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d7ed9b58b3c17fdb38776eaaf95e7849/45685222048.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/82394710258.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160752262d74a1---79522313530.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4cb94bf0fb78c461f40de8abc9670ca0/22691906720.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/23333890013.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fe6b118c0d1ee07f75d85b0ff849b1dc/dolifisofil.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/54983133012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rising+and+falling+intonation+exercises+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_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 17208 bytes
SHA-256: c0149aacdaa7256c1b6ae9c0fa264239817baf8784c9165c5551bb13bb8c6d70
font_01_sfnt_off00013c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C31 10944 bytes
SHA-256: 635837399280fd8410aaf838109fcf7a8de38140a8882723288a03f5aa8ba7a8
font_02_sfnt_off00015581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1