Malicious PDF — malware analysis report

Static analysis result for SHA-256 3767e45ffb299150…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 17:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a74dd8a62bd37016e09ed21179a3dd37 SHA-1: 52fa69a5bb365ef2768d3460fb30de8338c025e0 SHA-256: 3767e45ffb299150b5b92240b9bb9bcabdb3f4df0aebd493d6c11cdc30ddd7d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI links. The presence of numerous links pointing to various domains, some of which appear to be compromised WordPress upload directories, suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://expomediainc.com/upload/file/96944613783.pdf In PDF document text
    • http://tsutae-f.com/js/upload/files/56392712428.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abbbfab2d1---lonilo.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/komimobitegagolazunut.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/34583904108.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111434c98f1d---95027715962.pdfIn PDF document text
    • http://goref.ru/files/file/xanisenibukabutanexomav.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/64300243339.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/botede.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3a4524d6f---liguboritum.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/52062076615.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608723fc9d920---sojona.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/70881500461.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/wumejawipak.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/85471377553.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b91352564c---pajewolagogekexujasatex.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/fakeguz.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/8fjqa6k6ifq33flempicruno95/zatek.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089cd3b2af68---wubobinekalulagilovopoxi.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/h9lgm82t6q26tibauoanisid28/51466381711.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/38961925421.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/945a8dc16553e8cbc4f98b78ae65dacf/93689969314.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9be58bcf6---bonaredutaserobiz.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/pukig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=technique+d%27assemblage+bois+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_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 19000 bytes
SHA-256: 33a2d112e301572ad0bfa30f804b91a6452c9ec1917cb42d7b3d25f0b57aa768
font_01_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 11252 bytes
SHA-256: 00f653a87f7ba6148f0ca50b47c6d162ae945644b4346bd6a5bd4df57327e474
font_02_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1