Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7189043e0ed5a9…

MALICIOUS

PDF

91.2 KB Created: 2021-09-05 16:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d43adbaa28cb7e23e4bdd7709f28ced3 SHA-1: f681b946c9dc034dc5832cf4643da36c635b2b16 SHA-256: 6a7189043e0ed5a92bba5c5c4798dc934ad9c4b29182432bcd3dc6ae31518dd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://email-database.info/userfiles/file/kalofoxesuzipor.pdf In PDF document text
    • https://bestofbucerias.com/upload/file/94269268539.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/tisedonajop.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/gogufuderepitimezeditim.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/98741664729.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/wagugebolofiju.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/bup61emtp5pska0q5g0bot3380/getopite.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/69645443265.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0b590adebd943df060fe6dafd971521d/mifudonenafuv.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/misebawewaluvi.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/dumaxokexojoxir.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160742195c2424---19467856735.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc066c08f0---3048700936.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/degaxixosozozaromenebi.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/44888453347.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/72849745146.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/10439604956.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cd354b45a78601776320dd1c8c00ed0f/27396453888.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/87103791369.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/lemixazesotowabonux.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/16568849364.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0febabce1aabc7c05eb728311350cff5/24569974253.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/56a58bd612b746f6d58d9196357300e9/86113147876.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28901024057.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088252bb4fa5---kidavosawopowikakevopiruj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=renault+kadjar+preisliste+pdfPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/22458058502.pdfIn PDF document text
    • 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_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 21108 bytes
SHA-256: d316499d80fcbcb5c15ebb72bd267372ff3ec161faca78063bccba7612d02697
font_01_sfnt_off00012e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001467e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467E 10736 bytes
SHA-256: 840034ad29253fea2f06e891051ed309e5475c98c427ccda6c5a2bdc186143b9

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