Malicious PDF — malware analysis report

Static analysis result for SHA-256 679a5c1061e20656…

MALICIOUS

PDF

93.4 KB Created: 2021-07-03 20:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 47e58dcae21c2f450c8450706fcb1b22 SHA-1: 6baea43100bd1e7dff81cc31e0e472121e271c02 SHA-256: 679a5c1061e206561e99c4d679c3526b71f53fee0906316c9bbcc574648af1c4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests the document is designed to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://almondzwealth.com/administrator/imagetemp/file/16722787175.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5787770fb08496944294b2fc47e77126/wesojobirilemupo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/87c49a3ab38bc5bf6d9fff79269a010c/14266663907.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c9df36e68---88864251069.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/88216093071.pdfIn PDF document text
    • http://strandedtattoo.net/file/jokidurirax.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/93784918808.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/a8daeslttubgqmjphautlfi8j3/datuma.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4cc2d3a3---58023428141.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10fed8075b---lebigejinekidusujepu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42f02c959---80344578556.pdfIn PDF document text
    • https://serka.com/serka/upload/files/sedakopaf.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/38517327031.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/15614864690.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9cd51e77b0a5cd41187d60145f65de4e/nawagijibe.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/50936811707.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc9e776f4a0ad3a9b0907f16f75aa5f2/dalaxipozibixakipaju.pdfIn PDF document text
    • http://ihvanturizm.com/rsm/files/woputofozulafuz.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/jolutazovodabatusuz.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/damatetafe.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/4cd957bc0f6aa9fb17940d85720691e4/42666254725.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/33444685975.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9442e18db---34314055239.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6062e4269ed50c85e65497a06cd0147e/peranudubokozasekuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+app+for+edit+video+androidPDF 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_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 10564 bytes
SHA-256: 0a7136015594fd2d75774e9939fecf8ba115825ee40212945732c54038275735
font_02_sfnt_off00013d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0B 16568 bytes
SHA-256: 748c7fe3d05d027602618427d3e757b2ababd579276e1d97fde1f56d2fc73260