Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1f9f940efcdf01…

MALICIOUS

PDF

93.8 KB Created: 2021-07-24 10:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1358c9d420d5262740a76bb851882e18 SHA-1: 97395625c50dcd94028dfad03c5b853ed19332af SHA-256: 8a1f9f940efcdf01df22c7e47a1a47fc259130444d4cbd489ab2bf69ab5dba66
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 high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple links hosted on compromised WordPress sites and disposable domains reinforces its role as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://tradingphrases.com/userfiles/files/fefoditemenotoxosedudaz.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/8a94e8fa0251f065ac670521ed75d6ee/70885989246.pdf
    • https://paklya.su/design/img/upload/file/sugumedelenujobu.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/af9abd05dbc3cae5447109993fae155e/nadurafasarasutupimutejag.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5cca886c00---zipawimipesokifuxemaki.pdf
    • http://www.allatpatikapecs.hu/images/file/85236493521.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a03f49392a08a25ff873f4a8c811d359/53604910829.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/82897446fb7fb38b594eb05f324c14e2/49620142955.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cbdbee87a84bd93f0cf0903b7c3157b0/50414581324.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f52b4ac9---radewegaxisefabajan.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/60905155022.pdf
    • https://acronimocostanzo.com/userfiles/file/telenotilokikokulisuv.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/86b66a37c760f1dabb64a3fd9dc8ec10/71707042103.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2af800ee---kafofojolobuxanexozuvitu.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tkb4dtven5votrf303hesqgs5c/zipiguji.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mfkve31spqc8bq2ntblcfc7pc4/movomavogasizabipuzituviz.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2c50a668f94604c74ec07105a44163be/xoxemubafemafedawoz.pdf
    • https://ceccarbotosani.ro/userfiles/file/fajiwevawumadiwadanutemol.pdf
    • http://global-insurance-broker.de/downloads/97292654184.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798cdb6ad3a---rekenimode.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/japo5gl4meink4t8gua4jvgrb4/wezagedaramutagojusexamaw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=icloud+activation+lock+removal+free+for+iphone+11
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010925.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 16792 bytes
font_01_sfnt_off00012137.bin
ad8a675513677fb5b3d3f59e756a06f3ff24168b36d94f10d72a97928fde8aa6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 17220 bytes
font_02_sfnt_off00014e8d.bin
fc120b25ed628d6aadaebca19762e6f399a1644c444c4a753ba1182de67f378a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8D 10976 bytes