Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3fa6724f27ea3d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 14:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3bfd37abb160ee787da30337e6fc4714 SHA-1: d4277034ec252416b6addd45e41968aa29a7e6cd SHA-256: cc3fa6724f27ea3de14b64010964e2d43e0381ae1ee85595bce891b77d35b5fd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple links on disposable hosting and compromised WordPress sites reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6a5d3ba75e7a6bc394fbf5b70ce9eea4/pirujapikisamitugamaw.pdf In PDF document text
    • https://landbondcorten.com/attachment/file/848982a04838e993b81f5d1560cf04fd.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/90946951885.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/zaruxelesolujeduseguvelu.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6fc371e8075ed98f3c2b4b72c3159403/7310984901.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d902cfe9b08---nutapibitoxitipa.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/67522979713.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/97658018090.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/venewerepir.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/50181670644.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/31116882285.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5f9b45350db048a8da5f6314c22911f6/74615707124.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/55598325029.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/l3det373kekvjoeun0gnrlaokc/rurozawesur.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f5fb8983e21a55f370a152b82123e021/90367464344.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/ff451ca1215087a52384249e7cb09359/fijanuwuzatisix.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/36135192262.pdfIn PDF document text
    • http://xhzhengli.com/upload/14018406283.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2f33c119---78342277387.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/fiwavenejenegeve.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/javisumepopetonomuvawuw.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13063015f5---patasexirisize.pdfIn PDF document text
    • http://kag.fr/userfiles/file/4029248621.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-30/20210530091718851975.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/xasuwaxorubivewivotivoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=stochastic+calculus+for+finance+steven+shreve+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_off0000b90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90C 15504 bytes
SHA-256: 53be2a92e0a3833298972ecd9440465a877815c9d64ebcbfb8e27b7cfe2dbbef
font_01_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 10956 bytes
SHA-256: 32cb9afea2e3fe63ccdde74958d557d1b8a5f5e67877ff7b9fd0e53ac1082e23
font_02_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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