Malicious PDF — malware analysis report

Static analysis result for SHA-256 f661114f768fb064…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 13:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9882d104bdad5021908c555dbe43f15 SHA-1: 68ffecad82819f85154420bc5a5d31c7f94c0305 SHA-256: f661114f768fb064bed6663c75f8e3eda8fc4c594a3f8d07565af0f2669ebb36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ff-engineering.com/userfiles/files/79965806025.pdf In PDF document text
    • http://onlineticketreview.com/images/file/10782107107.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b96b5d58f4920ddaf5062a836240b822/nizakemuripubutazis.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/24430452333.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f18f45c7651d5d11bfc309da6284fa65/werowikapuwokifef.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210813/file/16288205799839.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210704035856.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/gawofaruwarezutoverakana.pdfIn PDF document text
    • https://led7.ru/file/nasezebozazijubexub.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nokobagobatugomu.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/pifolapivawutupebesas.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a440b78eea---tisotigal.pdfIn PDF document text
    • http://kalikraft.com/images/file/potulatevenaligegamuna.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ccccd2e941a915e7c5110ed30a056716/medalotulonib.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/1eef8746c579f64c80fbc556fb498e3b.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/fa52a2ca247441a820ae2c116cd01e8e/rirolesaxenuvun.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d049ababd932a183e57fab6d9dcafb96/zetosikin.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/74255578754.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160f702a76fc05---55224713160.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838c0f7dc8f---8546453172.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/rufat.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/74046246236.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/68786125438.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/22f6f6ccee1a2e70f08709abf739cf63/tawekatakede.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/35679867454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=9+times+tables+worksheets+pdfPDF 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_off0000d021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 17516 bytes
SHA-256: a56a069bbfb608ec5cdfa7a0ae38a3bb5cffa938cee54a18fc06533c1663999e
font_01_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001153b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 11048 bytes
SHA-256: 8dc03b0cff85f32f50bc306e33af35b30d4c04aac2dcec1cbc450743a402b768

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