Malicious PDF — malware analysis report

Static analysis result for SHA-256 6731515253285fa2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 00:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea877ba1f70379f1f9f98415d0527374 SHA-1: 45a0c1b2d4abec684b0a589e07b5db6382cfeeff SHA-256: 6731515253285fa27ae37175247cab3a4fe35ff1a167e4b818eabed07ced7b01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. Several heuristics indicate that these links are part of a link farm, with some pointing to compromised WordPress sites. The embedded JavaScript and the nature of the links suggest an attempt to redirect users to malicious sites for phishing or further exploitation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/lepepiwixa.pdf In PDF document text
    • http://datacomsystems.cz/userfiles/file/luzegeribunirejubosogis.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/63893022160.pdfIn PDF document text
    • http://skisun.it/userfiles/files/rotaxonepamunusove.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/73547786922.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/53296965620.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5998790058.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/38880826092.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/65786081101.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/wogabimujo.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/55823624257.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/32290667087.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912100815.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613204ede234b---78747123445.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/bodovemobe.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/38414057713.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/zategukanotatido.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210915201515.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a05053b6---35914188996.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/emndbh91a3eoicrnt1t2s6vd59/piwilevumizowevixuta.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/vumix.pdfIn PDF document text
    • http://cityfate.com/files/files/9913558212.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/84839104547.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/16084331473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=nova+3+near+orbit+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 17872 bytes
SHA-256: 5b21618ae32a4163a604755e33914b8c6f206e987138cbc1a99ada31b22710c8
font_02_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 10516 bytes
SHA-256: 4505e0ec9582b104b376daaac7f5f70590f0a3dab10d604d6798d5820a9437db

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