Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d983867b4a4d42…

MALICIOUS

PDF

70.4 KB Created: 2021-09-10 05:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d704a787edb9760d8210d0fd304f3df8 SHA-1: c96d5a5b91ea1d7e413f6f9b51af598c07dd5e66 SHA-256: 43d983867b4a4d42757042a875a8dbb01ae7ad9bca4bb6051e1e03618037d7f5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://egokituz.eus/files/galeria/files/38869097840.pdf In PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a811288ec1---domovodufabebafasovixa.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2936a78a---joxuruw.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/demipokesokuviromaxisujo.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/sn1r917aa4d58cl7fpi0jf5u04/jevevamisekezotemawofefo.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6137970366696.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/27247447319.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5b0f6bcd1f79b35884de0c61b2a85fe8/52133663105.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109040845374886.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/31446408295.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/65673912404.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/9380305754.pdfIn PDF document text
    • http://profstil.az/userfiles/file/xekibajoval.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/sasakud.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/30634376710.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/28405087790.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51372860435.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/89753b44efcce744bf8bd207d6050cfc/xumomivofagusopozibuxi.pdfIn PDF document text
    • https://hirurgija.me/files/nekafijilawila.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fazadunokerolebosufirufim.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/40963344339.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/90541327364.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/tajafo.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/89534982661.pdfIn PDF document text
    • http://marymo.ru/uploads/files/87975699402.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b82d1bbe---susojidefakofewifivebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=boku+no+hero+academia+all+moviesPDF 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_off0000b7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF0 10848 bytes
SHA-256: 58c9190c66784d80c140f5a7374b95bdd35dbdaec40edaa7599076f76ad5e217
font_02_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 14044 bytes
SHA-256: de5308b87f5cce334fa7e6a6fbbe8b650e8777166496e01334ccb23eeef17b08