Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e967c5d3ce559e…

MALICIOUS

PDF

90.9 KB Created: 2021-07-26 15:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c5fc1ca033d56c7638b119ef4d64f577 SHA-1: 8607b063b950eae525494921927f091b0aac632d SHA-256: c1e967c5d3ce559e9c47a70c0716a9600ce7220fdb2ad3b091a71ecd85dfdf29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a link farm pointing to compromised CMS uploads, indicating an attempt to lure users to external sites. The presence of embedded JavaScript, flagged by heuristics, suggests potential malicious scripting capabilities within the document. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://theurbanthinktank.com/files/wusemik.pdf In PDF document text
    • http://allamericannursing.com/userfiles/file/kezanuretukuwalube.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/dasedivilapujapaxus.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/20362538802.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/14c56bd5ac9746b14a853da53af7d46c/zagetibejek.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/773d805c0a6f7c605bdbd341b0115571/zusafovaberapijozotinu.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/83941443236.pdfIn PDF document text
    • https://irrisyst.eu/files/file/74731474080.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d197008924---93822936380.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/66o2suhsb15s3bnph9dpsda6hn/39291021740.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/5313789762.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0185d091f437d30e9cf224d0e637f855/dagekiligajowo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c164047ce61---46733362701.pdfIn PDF document text
    • https://12waktu.com/contents//files/69076044945.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/93ae705706a30060a186090ab2ad5871/joxubusosirulimolipa.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/muwusebiz.pdfIn PDF document text
    • https://grandmake.com/userfiles/tikilesutevanexug.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/97821828435.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af95ae80a9---93037150986.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b475f355cbf---16215695123.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e62485ed8bc---gujawo.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/kezolamolajizerimeraro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=league+of+stickman+hack+version+free+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
font_00_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
font_01_sfnt_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 16832 bytes
SHA-256: 4055081fd545dcdb768780445664a901b3661666cebcbf7cfd8500a26a9aa50f
font_02_sfnt_off00012a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000142a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A5 11224 bytes
SHA-256: 37bc860d6e613645f09b2ecf0cb4c659eadd3fe351329955e9045eb216f6fdac

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