Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea804ee6a1334e91…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 15:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 140e5be81187b685c1762d74850ed245 SHA-1: e64c249fe0e74e31ab4a8529230281a7054e6f2e SHA-256: ea804ee6a1334e91c11b4bb2aaa40bc33fcbd1a46f4bfd8e193aaa5606321693
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are flagged as being on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=nerve+full+movie+123movies PDF link annotation
    • https://cantellodetersiviprofessionali.it/uploads/file/rikerudotekati.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021092516254273499.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/vukuzupojolot.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/nifel.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/fizetuwakuz.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cadc792b1a---49682225944.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/sfdnu54utki0v1cs6upnfgm7ae/siforoxavezofav.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/pevaroxenu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/33794108362.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138434901914---19876770669.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/vexitivi.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/mazususabukufijetufiv.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161464520bfd8a---muxutevokisalewevu.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/84468438489.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/vevixifufuvik.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/sojozesolejipibixadulof.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/84595661924.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/nitebalovolozudadatowul.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/lifowejanoxipulajubujive.pdfIn PDF document text
    • https://ckd-otto.com/contents/files/62970761361.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/33118097689.pdfIn PDF document text
    • http://chamdure.com/DATA/files/senazidomidil.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a0e42be3e831e5fc13c71f8639e15d0a/xobebabugizexige.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/140250543435.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_off0000b3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 17148 bytes
SHA-256: 80676f947d4a3b0099eda45562096a9b210996deb6bcbce709878004aa324575
font_01_sfnt_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 10500 bytes
SHA-256: 6fa4eb0edeacd521701a58431961d20f28f0bf636c2e4efe0c65ff5937fb8c18
font_02_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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