Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb52bdcf03e1d17a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-21 20:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ee5b1ff9169d2d53c6b23d87e35b670 SHA-1: b9ace87ecd14f12aa2c0886c79d118ed02b0f2f3 SHA-256: bb52bdcf03e1d17aa1d9c98d9556f080b77f336d69b0623fc5726f019983405a
176 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with several heuristics flagging links to compromised CMS uploads and disposable hosting. One heuristic specifically points to a raw IP address, indicating a direct attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hyunshin.net/userfiles/file/kuzameke.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7c2a4c76313a877dced962d8e32625f8/rotolutaluworipuwepakin.pdfIn PDF document text
    • http://zaiger.ru/img/file/32469280927.pdfIn PDF document text
    • https://mmtours.si/uploads/xifamipetepisulepirefemop.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c7ffde7a9eeb0f3b5ba3e400fa518045/vososudikusoxobapunewu.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/54979097791.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/luwika.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/fojod.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/66624736594.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/85971681611.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613859199bda9---7725649103.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/fobiwevexejur.pdfIn PDF document text
    • http://change4best.ru/upload/file/78496273741.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/wedipomemuzivemazu.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/80879204428.pdfIn PDF document text
    • http://chineseclothingonline.net/File/94884122913.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/gidejif.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/55362879992.pdfIn PDF document text
    • https://labelmarket.eu/data/file/17863048030.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/lekupebokobewaloworuxo.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/nuxifutunidifod.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/58567715453.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/lesorigarenaxexazotemede.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+version+release+datesPDF 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_off0000c342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC342 17740 bytes
SHA-256: 6ed1267503cfd63ca68e77e0e6b142019dbafe330ce9ff2cf4a68300d7e00ad8
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 10288 bytes
SHA-256: 80e22aa40d221ef77a95fe337d13ebef34e04109f95e30d8b4a3399c739d3670

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