Malicious PDF — malware analysis report

Static analysis result for SHA-256 7175ac7a0b45fbd7…

MALICIOUS

PDF

87.7 KB Created: 2021-07-04 07:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b897e822d16a7cdc54fb26f44bdb3ce2 SHA-1: a4dc2c2a9aeb919a571177141da432fc1295efcc SHA-256: 7175ac7a0b45fbd7fbfbb1aa32b09fb4dab02824c440738479af564a8c4d5b96
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, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to host or redirect to malicious content, serving as a lure for users to click through.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6201bf3b---tefezatijaxemuvakojozila.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606faddd93219---juzodojesajudawinekuro.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086862bb13f3---robibefureguxoxil.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/713cecabca5c954e9f626bc5aa7781f2/ximotitikexav.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2599663d---pizumajulowomesedujelav.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969af0729b3---33346381603.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e9f540c4e20d2383206b58825d87c6d6/43711278909.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160882577a4510---50271843477.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/zovajujanibegilubizoxi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb4d117c8b---52204039632.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/70149fcb32bc10f36ccd153ca61fab33/mabuwarotejopaxozoluriko.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/37013582415.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f5b4a2e880c85e122aab0cd895054770/46450265707.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/xipinuxujadilof.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/42beab74269a6a3278265c6f5c1099f6/rusojopipipak.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/18/file/20210618_032451_160.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/2096384492.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/23076066242.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c84b486305---31389261657.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/9f141b7446d543ac347698948f39db68/pedikurubupewofuwoxixajik.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87a39af032---29571317605.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/80304135792.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/61058124191.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e7ca283b94dd15309addebe0079db60/pikabupejakudusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=vasoconstriction+in+coldPDF 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_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 17008 bytes
SHA-256: 2af4c00e2650dd951738a8616bf2421fd24993a7a1f6c8af8f98f0ac106a8cf4
font_01_sfnt_off00012259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12259 10200 bytes
SHA-256: 5ffdb05f89f676310c12bd16bd6ee6a63f43b031aa1955106a9c77262ed6b5d6
font_02_sfnt_off0001395e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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