Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b6072ddd55e0c7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 09:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: caeb750996cc9bb038e4d190d2e5a685 SHA-1: bc68b540440517190fbb0b9c567de3446a99b1d1 SHA-256: f5b6072ddd55e0c7cb76bdb238a8d1ffacd9a1abd5b9a059eca63d53f4516dd0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites, potentially for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jxlmedu.com/file/files/20210730_012800.pdf In PDF document text
    • http://defhjdr.friend-match.com/upload/files/zagafogemamivetavesakosus.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/7dbb4887fc5d0349b805e159d5199662/dapidawugabarimuvotavulo.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210807_F486AE9FD6D44EF5.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/27479964440.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/46518882624.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608008177b9b5---mesulexegibokojawepa.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103229e0eaf6---52678088434.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/rovomoviboxexorepofa.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/66873822102.pdfIn PDF document text
    • http://dogable.de/userfiles/file/92401624053.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160841decb2fb5---28648403918.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d29e55ebc7---86359707764.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/niviwenekeworuravizapu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a58dd99fbcc---vovesojotufos.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/14905874152.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836676e5cb3---munatuj.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/lofesele.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/wilukegawuvanotija.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/ludiguzu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cfa296f42b869ffe5c98eb54b7d586cc/74032437822.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9gb5tj974lrv8dnej8acfnodr3/51702296258.pdfIn PDF document text
    • https://combrooncom.com/contents//files/xijumojurobusiwolosuxemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sylvania+light+switch+timer+manualPDF 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_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 17360 bytes
SHA-256: b0ca490eb75bb6670ed8a0d5c1c77ef140c09c68162a02c039fbd044f4a50ecd
font_01_sfnt_off000113a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 10996 bytes
SHA-256: cbce42797351559ee156886e93f2b2d7cf125f033ee61abd265f8518aca9688b

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