Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41384a326d99ce1…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 22:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8899bba0712f65c03ef465196a273457 SHA-1: c183bd055ff063c8bea72749da056bbfb8be5f9f SHA-256: c41384a326d99ce12043efeba18f18ac95edb57c016fb312898e07bdde2fb9bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on potentially compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to distribute malicious content or phish users through a network of linked documents. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://veganogle.es/uploads/ckfinder/files/xevixukovojivovenij.pdf In PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/lokafabaxomo.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/21d9725a550e174dc91aa70aa44063ac/37359911278.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/2559761082.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/55450596358.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/wobofuxawozenaneduvetav.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/32624719067.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/37590088878.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109150855106347.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cf5d2b711---94974102884.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/goxonejamulelitakefokubej.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bd0fbcb730f88058a00fcf5dba6e903c/zapelufovozegiravad.pdfIn PDF document text
    • http://darstin.com/userfiles/files/tiwixalijadenodige.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/wixukatafonenilojepu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614447b1920e1---zupixavanivapamivifuj.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/tifagogawavedaxus.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/57998048044.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/xuzetibuwumulip.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/69848886641.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/begaragitofim.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///poxugesujavuf.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/23234705616.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/46786940369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=all+dragon+ball+series+episodesPDF 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_off0000be46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE46 17136 bytes
SHA-256: 48d43c80c60b8a2b9b88c89b2f13b11fd6a3328b005f530aee8a9daea3fc67a1
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 10588 bytes
SHA-256: 52731d0f8cad6f3649a3a69b4e90b4e31c61a172413de7c6011709ad0f1a3dfa

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