Malicious PDF — malware analysis report

Static analysis result for SHA-256 752c88a825651bda…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 15:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46e1a1d89f35741cc2f3b4c290c9b915 SHA-1: 5cfbfd413c1832b264e6db282ba14568b19e57e9 SHA-256: 752c88a825651bda8a6b5bbb4f3ecd9c1a95a8504632bb25fb3eb5b4652e6452
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/38e8a4328da84f8e4f303a5cd6b38520/bakufu.pdf In PDF document text
    • http://ccspatti.org/userfiles/file/84144455636.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/duxemulibiza.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941ef0821fa---95063435031.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/35084313023.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/12687036888.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210819151141.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce44602530---89157295165.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8c554099---wojuxawuduwobegera.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/53654931025.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/kofavopuwubegawifefik.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1d5b5675c---wubilo.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/72078237353.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/70829967109.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a534e80003eb33cb439e497de5a4b7cd/18829341461.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//62163508782.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/jonibutexujevobasib.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/06vkha3qvv0elom3d32hi27a3l/gopokokozexefipofow.pdfIn PDF document text
    • https://loctra.net/userfiles/file/2374154144.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608301f3b1ade---89876584809.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mirolajix.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/31127668193.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/834a6b4a37603257537180efeaafab42/42935401806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=struts+2+documentation+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_off0000b8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FD 15712 bytes
SHA-256: bf78a5521630c40a27a4c754f24d0dc3c11d835170f292c40bb8bf753ab2ca26
font_02_sfnt_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 11032 bytes
SHA-256: c6d96f40d54e838f9a49f01c85db2f9322bb1a9cb2daa875d0cf8598aaab3d5f

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