Malicious PDF — malware analysis report

Static analysis result for SHA-256 9459682f1b5a8537…

MALICIOUS

PDF

94.7 KB Created: 2021-07-22 21:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1b00578d46d08fe08a7be4f78a876742 SHA-1: 9741e4ca6ad9e40d0c42f6c01f7d39d6c3ce11fb SHA-256: 9459682f1b5a8537ee9250e11b186e5cb3beeb77e47eb9f45007667fc780d466
164 Risk Score

Malware Insights

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

The PDF contains JavaScript actions and is identified as a link farm pointing to multiple compromised websites, likely to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, with the primary goal appearing to be user redirection through a network of compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc741ceb78---47591949422.pdf In PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/8d1584e48c91638594e373b61715122a/93178001684.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbf32a0fc---kerujasoxi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92318804c---62176661038.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609096f39aaf6---fepulilumusa.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/542ab38f3a6608a3619c5831eb8cd78e/7998545686.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/85144963377.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/jowagolediselenig.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6j3urj2ckrhckhssvsd6t0s9no/tojare.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5rua2gjj5b2g1iu5chig81bel2/43811296141.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/vider.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ef0bb0c8---vetupajojuvifesetufeji.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fefupidisiseramuw.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/96008333073.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073725b188c0---68937587890.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/91816599716.pdfIn PDF document text
    • https://noddy.nu/images/file/guxap.pdfIn PDF document text
    • http://ttc-investco.com/img/files/39512955143.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2c8191b2a---kegapi.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/ruwewomomoleme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tycoon+games+unblocked+no+flashPDF 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_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 11040 bytes
SHA-256: 24d2181c7d5a0db61e4ad571f04861e658740a3ad5b7beeec02da8420319c398
font_01_sfnt_off000128ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 16796 bytes
SHA-256: 4079f6588de6b080d729b89b801cc5e7339a494374980bbc667282ff6f3bb4b8
font_02_sfnt_off00015474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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