Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ace7fe69176e83…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 16:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 78da77d622dd9cf92b4e529f7e31503f SHA-1: 0c8fd209e75ba2d534df7efb0327d70849856e1a SHA-256: 39ace7fe69176e83fc375f309d453d0fc9bb78d788689f4e60c9d0d7f45b2a42
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains or compromised WordPress uploads, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://dafelia.com/files/84860535250.pdf In PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/21412727286.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/pepitaripagefikifor.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/672273422.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/gopagukagogaguwopoza.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/nutobovupumit.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/nubudosamodevujalemitu.pdfIn PDF document text
    • http://contelex.it/userfiles/files/fexik.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/fivujotatalamifipazil.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ab5507d3---fozekifabesutekogibo.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/jeripitepabanapexebigix.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/mowutijuzapigiregutudexo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/n8jrs4if18431sp00d2icpkp6t/vetuxabil.pdfIn PDF document text
    • https://emenu.hu/editor_up/moref.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/wabivizisukuzonupigipaw.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/zanorosefepezemudaga.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/80208614285.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/06aefb688bcfd2c85b7502b350e579a3/92787491031.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/nogijisavekegis.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///rikan.pdfIn PDF document text
    • https://mlspoland.co/files/file/tonemixufe.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/fowuw.pdfIn PDF document text
    • http://amdind.com/userfiles/file/19570636236.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/56946827278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+free+prototyping+toolsPDF 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_off0000bc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2D 16340 bytes
SHA-256: eb11dff48a3bf7086291a6212eaec89dd1d69682f7750cdc7cc5fe5be4422100
font_01_sfnt_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 10536 bytes
SHA-256: 0e083afcedfad4ef41e0b50bcc91d26f09f60fb21f8925dd868110e871a48bfb
font_02_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1