Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f7aff8864fe971…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 21:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a30391b47f9a909bd45d3645462a437b SHA-1: 3c6d30f1780d29631023f4b9cf87c3db6919c25f SHA-256: 30f7aff8864fe97137b9666ee42095d9527a3175f9b9d761ec797271c5552a90
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. 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 0.9976

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 https://tenshinorchids.com/FCKeditor_upload/file/jomeminavurasolipo.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16145d9a208bbe---59765194928.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/77047806993.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/58334874256.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/37249756546.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/93386684200.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/45814248760.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/19422690436.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/silominejupenid.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/97174566147.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/s5ovpkrfug328ihnup8ne70g02/letinutunana.pdfIn PDF document text
    • http://splogservice.ru/content/files/42741762214.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/tojazis.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/gogilebivomatavozij.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/xizeno.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/tepubopogel.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/vafadaxez.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/nobepogokipogasesako.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/99812427274.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161303f1027383---54743984691.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140488f07d98---pimapereboviletesereli.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109041216213747.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/nuzumonazidivulesogixuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=holtz+and+kovacs+1981PDF 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_off0000c1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 10676 bytes
SHA-256: ccaef944042a902dd88d98423c7bd93d2270391b1e74e39f9527bb1965a14b75
font_02_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 17276 bytes
SHA-256: e6dcdd1653837654dfc7904fbe957ebb865ffb3ad1133fbd67f1f0c6e2370e5d