Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c6ff4c582448a5…

MALICIOUS

PDF

80.8 KB Created: 2021-07-17 06:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75a48021194f1c58d7c534404a22237d SHA-1: 84c07dfadb3f2c91bd3774bc99f517ee9682774e SHA-256: b8c6ff4c582448a56d50790a973aa5ded5642dcfc87ab64bba2fe92a80da06c4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to manipulate search engine results or distribute further malware. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ruedi-leuthold.com/userfiles/files/rowunaxulupaluseka.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e17df1dcd---22398685477.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073147d06c6c---62144093435.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16070c0cc877cb---36780382847.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/8702689468.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a6eeb8c6---23438366424.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/panoz.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lupudolatiwipuzisiwupidi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b857259fa65---zizetiz.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/99149420300.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/s5fvdctj49so910tm6s1tg17t8/28001015757.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/xigobabilaviwuvefawo.pdfIn PDF document text
    • http://dhf-china.com/d/files/mumitovekasabupukuzojaxa.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/81195888410.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2fed22878105cd6bc546ba95c9f228f5/60433648226.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/67101489316.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c116a95991---20168687393.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1on2np0hoo23edcrnunsogsrul/dadubuteju.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/7hoijct5cbk3ceu0g4tjis704c/63996984638.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/sidutefebakutadiku.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d8c37a0a5---88571768241.pdfIn PDF document text
    • http://goref.ru/files/file/wenifefarobixuviril.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/pafobozekivatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=spin+quantum+number+definition+chemistryPDF 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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 16784 bytes
SHA-256: a4849278e210e137a9def94d10a46a6487c3fab96c09c4bd56a6a04c4656a9c3
font_01_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 11412 bytes
SHA-256: 1f9be62637f83e6a197993416f50758300fd9e1293dc009756b3cb93b63dbf78

Open this report in the interactive analyzer, or submit your own file for analysis.