Malicious PDF — malware analysis report

Static analysis result for SHA-256 30157d5ae690d8b4…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 18:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aaf5d6c96f410fb30f8c8082488d7e1b SHA-1: fd97a768e223dff6a9790a2ddd8804e4d416b660 SHA-256: 30157d5ae690d8b4d5e97fc9f49cdb207d9874b903205d853cd8f2fb3e71f91b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://learnazia.com/fck/imagesfile/vepukivube.pdf In PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/zajegewusazujazo.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/51327848373.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/68324180161.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/wukekenafesunadusa.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/51497370316.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/08/202108261402504259.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/cfdb967faf001aa42bb960f1d949d0d8/25487518961.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/femekerojolefab.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/79009565700.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3fd9d2478---savarazibu.pdfIn PDF document text
    • https://milkyway-vn.com/upload/files/94980128770.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/6d2595ec271be001aaebb1cf274485a0/buzedukixudof.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/53be7e9bc3fc87d74a9bb0d9f00cdcf4/mexobimodomifateduvivimol.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ef527bbc---64983503140.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a980c17f6---sugadedorujowupafekobipu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b2be02cc895---bokegasex.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/zovof.pdfIn PDF document text
    • http://learningkey.org/userfiles/95858032884.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f2f26622---99961247339.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/vikumefugufukurat.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/t1fkecbgb8c77cvrkg0f8d2877/tubapazawobik.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/kavewir.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/powajegiduxemokerifidop.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/93124683295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ibps+clerk+2019+books+free+download+pdfPDF 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_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 11152 bytes
SHA-256: 22cbc6b253bdd6ae4f2fb293bbbc3044ac076e3939c45aed45476eb81d7e2c6b
font_01_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 17556 bytes
SHA-256: 70a777fc2d5510936aeefb420d93c7bbc2be7ff61630086cce1b2fa879f01505
font_02_sfnt_off00013749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1