Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c1a87f41bc0dfc…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 05:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 775c98d178e3072386710c52b5ea919b SHA-1: afb1310e3d3f018ef23a14fd6ed11783dce76ad1 SHA-256: a0c1a87f41bc0dfc81b858cbd56ea9f0ba032ee3b9d8a773df0e1f95b48dffa1
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hsse.hssanesteban.cl/files/marepurugejixumikunoza.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/jaloxip.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/peliwanojoduminizumu.pdfIn PDF document text
    • http://showdoimovel.com/files/files/raxumogotewowedakatax.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/vefav.pdfIn PDF document text
    • http://live-net.it/file/87931744074.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3cd42926---ratifib.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/27520883179.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/49715420017.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/mekuxu.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/48355719070.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/godelosorumujewubezutarip.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/98436647469.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131160b2072a---juzaxifovopunukujubem.pdfIn PDF document text
    • http://riviera.az/userfiles/file/bopavu.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/bonagabirerowuva.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/wagofeko.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/11640240703.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ce24640f---kavibapapabinixewanorojil.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/69416865014.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/kevevifofepapulaxi.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/zefutixodofased.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372b98aa795---67851486761.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210904064643090731tnosi.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/wagufejib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+offline+movie+appPDF 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_off0000c13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 17272 bytes
SHA-256: a05acb12707ec4a4d00d2921b8e56e5001083b390e101c006cf1339639598e17
font_02_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10536 bytes
SHA-256: 12d872cadd25b035fe21705e7abcff36f4f9defc9d87585e0e9959e90b1d563c

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