Malicious PDF — malware analysis report

Static analysis result for SHA-256 7414aa566e1080e7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 06:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86fb6fa92ac5cf082a89a1ecaff3de9a SHA-1: 5839e2aa16eb95fed145915497ed9da30ff2808f SHA-256: 7414aa566e1080e71585abd2224bc3b79c565872b4fe7b18f0ad17aef32e1ab0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple external URLs, some hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a malicious workflow. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oiseau-bleu-morzine.com/userfiles/file/fowetijiriterasuji.pdf In PDF document text
    • http://ricarda-allegra.de/userfiles/file/wolufumobunefizoxevavami.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/49299929740.pdfIn PDF document text
    • http://agilesolutions.in/uploads/fofugadoxobalilikezavimi.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/40092287494.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30c5d2110---pokiw.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/xomeje.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/79a81bfe35542e7fcb40a51bdbe76fc8/11066108930.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/9119078830.pdfIn PDF document text
    • http://scro.ru/pic/file/14452268007.pdfIn PDF document text
    • http://innotack.com/userfiles/files/negivasatedijo.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/tunudobobori.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/xiniluwis.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/kuwise.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/xezagedageru.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/77iaf7ib9breq9o87edccvv0sd/68944292145.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/07/42392668075.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132369a6e8fb---nefabutonoxifemezafa.pdfIn PDF document text
    • http://att-na.com/upload/42156167987.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/suxotuful.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/wawekoxenesimudaralulopiz.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/32116832721.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/jodun.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/91479076445.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/20361070795.pdfIn PDF document text
    • http://dnepropress.net/files/file/danaminutekinorume.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/fugegixuwop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+transfer+internal+files+to+sd+cardPDF 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_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 10548 bytes
SHA-256: 584d9a441e332caac23ab26a0c46e3749938e68425a4dce6cf0d3374efae0a2a
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 16836 bytes
SHA-256: 4af23e4d353cd5f5707066a1ad176b78ae0670c68c7b596a2f9b8ac095292b8f
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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