Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de0df40e55cdfb1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 09:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f9d044c54d3c167c55c5ca2592dd6f8 SHA-1: 2935f70db118ea0823042d890b09b2efa7c641f0 SHA-256: 9de0df40e55cdfb10153b8fff6da1c41af90962816baf0302c05ba87d0be2536
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing/malware landing pages. The embedded JavaScript suggests the potential for further malicious actions, such as downloading additional payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=matrice+600+pro+user+manual PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160744285770bb---51128622032.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5584a5cf3dbbe92a484f0e067aa3c65f/kipiw.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/xadorexovasijudurit.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/008aad7fc253c7a844a9592b33f50260/xumusopuvexopana.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/45932959025.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/kovo8nge2vrtpn6agkpo085dcp/30729766221.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/63890706126.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/28468839476.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/dilefawujofurefafonoju.pdfIn PDF document text
    • http://byecook.com/ckupload/files/77545577493.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/l4dmk1ea394ofgl0otpc3eodu4/zukinopamuruso.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/gazizezulenewawotopiduti.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d33cacac7---barukoweperegewekoj.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/pedinubidodipiz.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/baa5d9f16dc63d91c4262280faefbde4/jogopinamibab.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/de54330913bf1bde06e09f011566ec85/kuvimizowebobimin.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/xasikomemaxomamifovev.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4ba6d949ea9a78a6aa5f0bfa9c14f229/donuzun.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/forofodekodeluloku.pdfIn PDF document text
    • https://digireg.com/upload/88890742527.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e180737c---diwad.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/33548971562.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/92027216024.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/ximupodekigexokominaga.pdfIn PDF document text
    • 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_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 18104 bytes
SHA-256: 2f69e2eb921e78ec33254c8ae5c19402e2b08ccb71ab8263b00783dd8706e4d0
font_01_sfnt_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 10920 bytes
SHA-256: 608f063912ef872145461a51cd7e71a3b94fb08295108cacb878dd6fa226ff91

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