Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2761e653b207fe3…

MALICIOUS

PDF

84.1 KB Created: 2021-07-01 16:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83644f0a6460e62ad14148f7304b0d41 SHA-1: 8c76e3ebc2cd8dedd616d7bea710f31ba557c37c SHA-256: c2761e653b207fe3e04d99fd854161be37f3dd3e7c9573550c9865ea02247085
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary indicators are the embedded URLs and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/joxuvaxi.pdf
    • http://naplesredeals.com/userfiles/files/92690415510.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba85b26e59---41034638491.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/18vatlcfjcbnj9i4vik9310seg/79029154964.pdf
    • http://dmkaudit.sk/101/upload/file/molulenojajixavotiresij.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf421d58cb2---7597116287.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608419f477286---retemibuka.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e76f31bbc---powutepumijerabegitafomeg.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084798735f61---82635890915.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/1650165bd6cdb86c64a7d054ef75cfef/wajopege.pdf
    • http://av-jet.ru/userfiles/file/55553710893.pdf
    • http://vitajeans.com/ckfinder/userfiles/files/sumapulagenopaminumavut.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6b9071b7---kamefogewuwo.pdf
    • http://bwc.lt/i/kubamowaz.pdf
    • https://contabil-fiscal.ro/mm/file/19228990373.pdf
    • https://ltssinternational.com/res/wysiwyg/file/7293667617.pdf
    • https://mmagame.com/userfiles/file/44442221315.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/431mpnoi0oa0eopuf4e7e9tr33/19345546524.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7leu34dsd4bqqe7iq3pq04tes4/21145090134.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/89609047561.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/855213ebe4255fbfa98c3e156b7bdfe8/92802272292.pdf
    • https://cgeminfos.ma/upload/file/xevasigawet.pdf
    • http://winkeleninzundert.nl/uploadimages/files/belivitegabekejod.pdf
    • http://dulichgiahy.com/upload/file/54098431128.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe3bd14db---21131741435.pdf
    • http://mt-filtration.com/uploaded/file/169501070860cfbd4ca712e.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=someday+my+prince+will+come+lead+sheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3cf.bin
307b3a0eaaa7f663f5066399a466a7ef70ee92cce8b4e25f683f5c0741ab57e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 17324 bytes
font_01_sfnt_off00011148.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 16792 bytes
font_02_sfnt_off0001295f.bin
17e1e85791948f8c1f7f8d711b8f04d3ddb149c04ce0f8b1362d1abe1f460476
pdf-font-stream PDF embedded font (sfnt) at offset 0x1295F 11052 bytes