Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce358ad70d42360…

MALICIOUS

PDF

98.6 KB Created: 2021-09-06 16:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3a04c0560bab132d48077296dba8325 SHA-1: f3ac0be9c6c58af4e617b16440eee2985773a866 SHA-256: 9ce358ad70d42360449ddf23d01990d6f0e4c5ffa895e9c1e0cdeff1fa4c254d
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites that host further malicious PDF files. The presence of numerous links to potentially compromised CMS upload directories suggests a distribution mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/mog3679ppa7et5fdli4s7mm31e/jitofofulebujojik.pdf In PDF document text
    • https://foodphotoshop.com/userfiles/files/zivuxagobof.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/65572470445.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/21864732788.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/lepukosuzomal.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/bebividowugajejo.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/77768973704.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/hitecbl4v70euh0qcmfflo9hkq/65376151970.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cfbd2871---rakatozonona.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802f83b6e3---pibodilirebu.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/dad58e49abfe6bcac35516cedadb7dad/6817320807.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59593014235.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a05c5f7dc---95066524511.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/54617916068.pdfIn PDF document text
    • http://nktrading.qa/file/files/dogopimixuseguzipatedopir.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/68079942732.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d505d421335---71243129750.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/paxaxaroxe.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/08/202108180103043343.pdfIn PDF document text
    • https://nadamasristorante.it/file/17242335194.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/42851569259.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/79549462620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=international+events+2018+pdfPDF 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_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 19048 bytes
SHA-256: b033eda307f286fa75b89463c0d524af38bd91e75d63afbd73dc4579f0d8bacb
font_01_sfnt_off00014939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16150 11012 bytes
SHA-256: 50fec1a71afbf9ecb51a0ffeabcc5ecd831915035c1303ecc1de53a446eea162

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