Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db8498dd784b7fa…

MALICIOUS

PDF

68.3 KB Created: 2021-09-16 20:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a98815788bd8fea1665cbb5af0b65b71 SHA-1: 987e64c1b8b6cdff3b874b81d4dd1c3af8efb1f0 SHA-256: 7db8498dd784b7fa8ade8b6724b822c6d927d79f33b346d26eade07c34a43af0
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm or phishing lure. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crewmak.ru/uplcv?utm_term=index+of+vampire+diaries+s6 PDF link annotation
    • http://neuchina.org/userfiles/file/maxidamifonolalazuguzubox.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/jabadize.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/99106231180.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/72256447267.pdfIn PDF document text
    • http://mq-water.net/upload/jeluberorukibakunebafo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ge266l4b64mqn7al5g40a0qhmk/37382400780.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/spu3q7cfinltre7gdsdo9cbonu/58509383910.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/nopokeboxozup.pdfIn PDF document text
    • http://cke.hk/userfiles/bapekug.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/32295521377.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/112220288032.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/sijizenamusi.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/7nqklnqugspo2tsjegl6ekt0vp/dokodiwubuf.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/57581689274.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/61649627924.pdfIn PDF document text
    • http://czyxchem.com/upload/files/47966096415.pdfIn PDF document text
    • http://sswjeans.com/files/sogibuwiretuvigogelajiwo.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/16013652701.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/20196291280.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/iq9cfgosc65d9p02m26ochr6ec/tereseto.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/334f2a726f4853dd0873d5d16197fe3a/98216790599.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fa2ce6954---kiguna.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_off0000aed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 14488 bytes
SHA-256: 3942fcfc6ba237ee4a3f160f379a960266bb8f8064847d99ad0799c6d50808ad
font_02_sfnt_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 10800 bytes
SHA-256: 8313da9d42456ee07397391d5c4769a556c1090ff012b134dff3e71865b889dd