Malicious PDF — malware analysis report

Static analysis result for SHA-256 0427c4ff868f8f91…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 03:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d07ed3264696d74f015248ec1b50a6d6 SHA-1: 63af0664e6db93db503ee8a70c8306f05a204feb SHA-256: 0427c4ff868f8f915911b290691f8932f17845c20bf58e65f1ac8c5ea2b161c4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics suggests the primary purpose is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.alapan.org/fckimages/file/xozupo.pdf In PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53328167017.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/92456629457.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/45721617175.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/85807719444.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/kolikezimagonabevuvilis.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/26243087873.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161144e5ee770f---pagusisudogivukafujexa.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/39488265872.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9ca1f66a---loxobiwuvafeselafexale.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8d2c5c29fbada3b05f40ace2f4ab68f/dogopiwu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/22829400c255bb00c6548710973621c6/33653585290.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61c2bba6e---91621371317.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ga74ghpihnhsmtotnkgjpl4ql1/3938384941.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/37891262768.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/66722488467.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/balusimifevub.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/lafefos.pdfIn PDF document text
    • http://sissonne.hu/editor_up/paluridokanutarefojulinef.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/porevukori.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609208f9ccade---surejuger.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/tbarq5ts07v7bs8i31ip1s8ak1/titasalezun.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/bde3bea4cfee41918e0ec1257f957652/78280304769.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611d037b43a29---vabojimapubojupusu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160891917cd03d---34450353310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=surah+sajdah+pdf+al+kalamPDF 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_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 20604 bytes
SHA-256: f5e48abc161eb9b9a57ff64caafff088cb0294d6fe0b610f161f92fe89cb502d
font_02_sfnt_off00012f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4F 10612 bytes
SHA-256: 9cd16655b9789da1cc131f9530ee2c36b2f89c6a3c0a742fff0b56bed7733ff4

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