Malicious PDF — malware analysis report

Static analysis result for SHA-256 73aaa00c3f464d5f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 20:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9918642d3d5a07617856e824ec070310 SHA-1: 75ad4513564a764314e39c8c53e10223d100d94c SHA-256: 73aaa00c3f464d5f24b4143b7f383b602a74d4e8d174665a2ff6ec2fce2c6c74
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple PDF files hosted on compromised websites, likely to distribute further malware. The presence of numerous external URIs and link farms suggests an attempt to obscure the final malicious destination and potentially engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d609ae4605b27a90ff132d2b3855b5dd/33516043439.pdf In PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/46031978966.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/lakozof.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/50713733296.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/rabodexamejosoxudapara.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/zovokumesopu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7f00g8u65ku85ctpa8n4f50nob/53882676506.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9024a08f54---milevotudulo.pdfIn PDF document text
    • https://waroproject.com/file/wozusigobiwexisa.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5098310261---desakajisovobofuxalaz.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/63063694717.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/vurimixi.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/17598255174.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829ddfec1bc---83682489244.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160726e359a54b---xigavuwixotoni.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/28254237990.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c94b85f2e---pojabefewaju.pdfIn PDF document text
    • http://henca.com/files/details/file/xakepina.pdfIn PDF document text
    • http://4bx.pl/public/file/nixasazukanomolujaremizi.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/38604021439.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/a39bf74ae9eefb512cfb06950f5a3347/vutujoxakejuvuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=introductory+circuit+analysis+12th+edition+pdf+solutionPDF 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_off0000bbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD0 16916 bytes
SHA-256: 3a313b67f640c8bf7aa93d9b4659c914dfe7bf540fb3edbc55a8946391ea3863
font_01_sfnt_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 11052 bytes
SHA-256: 94080f43a941028fb67bcfef3e51b5cfc605b3d3130b9253e4fe1dfd0de77c42
font_02_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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