Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1abe49cb7e051b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-25 23:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01925fb622fa845f310d1964263a4b03 SHA-1: 504ec2125dfaa6d83d48fac8d00f3c64db0ec7b5 SHA-256: ec1abe49cb7e051b2c70fa6cba0571b96c1832d3b97d57da5c2070e38f8e8f8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ardennes.proximeo.com/ckfinder/userfiles/files/nuwijitag.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e045914fe3---89076314747.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/40904732082.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149345259ec5---94894023022.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/bovosasixajomesatulafore.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/jarajerederux.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fuo3rd97m95o7ok7p4j6o3t4fg/midexeneka.pdfIn PDF document text
    • https://duvanco.be/docs/files/feronabafozoditat.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f36978aa1b---59797104567.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/824464053.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/1866587655.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/5904821588.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/1102956428.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e11e3eae49b78f0602b77bdc8b4bcb83/mujin.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/fepejisitazidadi.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210905/file/16308323156411.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/kixuziduwudizozanu.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/xobipiferuxolek.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/pizaloforawuligusomu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16146a4e4a950a---bazab.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/38850150791.pdfIn PDF document text
    • https://buka.ru/sadm_files/30480610994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=stick+pool+club+hack+mod+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000fe74.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFE74 18428 bytes
SHA-256: 4fb2f84e060fc21ab6d3b92e61c957aff5ecd1333de45a70d985803b64dc2e37
font_00_sfnt_off0000b68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68C 10872 bytes
SHA-256: c8f6dba0fbbc74025d328c8425356adf4d1940b7b40395915c4a30bf594635c0
font_01_sfnt_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 18516 bytes
SHA-256: 5149e5542df8598509882736f05d87829e6c1f7e090affca189cf2b3715c1a53
font_03_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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